diff --git a/modules/angular2/src/core/compiler/element_injector.ts b/modules/angular2/src/core/compiler/element_injector.ts
index 7140a6c6b9..3c882957bc 100644
--- a/modules/angular2/src/core/compiler/element_injector.ts
+++ b/modules/angular2/src/core/compiler/element_injector.ts
@@ -47,7 +47,7 @@ import {
 import {QueryList} from './query_list';
 import {reflector} from 'angular2/src/core/reflection/reflection';
 import {RenderDirectiveMetadata} from 'angular2/src/core/render/api';
-import {EventConfig} from 'angular2/src/core/render/dom/util';
+import {EventConfig} from 'angular2/src/core/render/event_config';
 import {PipeBinding} from '../pipes/pipe_binding';
 
 var _staticKeys;
diff --git a/modules/angular2/src/core/compiler/proto_view_factory.ts b/modules/angular2/src/core/compiler/proto_view_factory.ts
index 24664f10ce..4c022b2775 100644
--- a/modules/angular2/src/core/compiler/proto_view_factory.ts
+++ b/modules/angular2/src/core/compiler/proto_view_factory.ts
@@ -1,7 +1,13 @@
 import {Injectable} from 'angular2/di';
 
 import {List, ListWrapper, MapWrapper} from 'angular2/src/core/facade/collection';
-import {isPresent, isBlank, BaseException, assertionsEnabled} from 'angular2/src/core/facade/lang';
+import {
+  StringWrapper,
+  isPresent,
+  isBlank,
+  BaseException,
+  assertionsEnabled
+} from 'angular2/src/core/facade/lang';
 import {reflector} from 'angular2/src/core/reflection/reflection';
 
 import {
@@ -505,7 +511,7 @@ function _findDirectiveIndexByExportAs(renderElementBinder, directiveBindings, e
     }
   }
 
-  if (isBlank(matchedDirective) && exportAs !== "$implicit") {
+  if (isBlank(matchedDirective) && !StringWrapper.equals(exportAs, "$implicit")) {
     throw new BaseException(`Cannot find directive with exportAs = '${exportAs}'`);
   }
 
diff --git a/modules/angular2/src/core/render/dom/compiler/directive_parser.ts b/modules/angular2/src/core/render/dom/compiler/directive_parser.ts
index 6dd0acc9e1..70fa28432b 100644
--- a/modules/angular2/src/core/render/dom/compiler/directive_parser.ts
+++ b/modules/angular2/src/core/render/dom/compiler/directive_parser.ts
@@ -10,7 +10,8 @@ import {CompileElement} from './compile_element';
 import {CompileControl} from './compile_control';
 
 import {RenderDirectiveMetadata} from '../../api';
-import {EventConfig, dashCaseToCamelCase, camelCaseToDashCase} from '../util';
+import {dashCaseToCamelCase, camelCaseToDashCase} from '../util';
+import {EventConfig} from '../../event_config';
 import {DirectiveBuilder, ElementBinderBuilder} from '../view/proto_view_builder';
 
 /**
diff --git a/modules/angular2/src/core/render/dom/util.ts b/modules/angular2/src/core/render/dom/util.ts
index af78f4dc0f..88ed6518f2 100644
--- a/modules/angular2/src/core/render/dom/util.ts
+++ b/modules/angular2/src/core/render/dom/util.ts
@@ -8,8 +8,6 @@ import {TemplateCloner} from './template_cloner';
 export const NG_BINDING_CLASS_SELECTOR = '.ng-binding';
 export const NG_BINDING_CLASS = 'ng-binding';
 
-export const EVENT_TARGET_SEPARATOR = ':';
-
 export const NG_CONTENT_ELEMENT_NAME = 'ng-content';
 export const NG_SHADOW_ROOT_ELEMENT_NAME = 'shadow-root';
 
@@ -29,27 +27,6 @@ export function dashCaseToCamelCase(input: string): string {
                                         (m) => { return m[1].toUpperCase(); });
 }
 
-export class EventConfig {
-  constructor(public fieldName: string, public eventName: string, public isLongForm: boolean) {}
-
-  static parse(eventConfig: string): EventConfig {
-    var fieldName = eventConfig, eventName = eventConfig, isLongForm = false;
-    var separatorIdx = eventConfig.indexOf(EVENT_TARGET_SEPARATOR);
-    if (separatorIdx > -1) {
-      // long format: 'fieldName: eventName'
-      fieldName = StringWrapper.substring(eventConfig, 0, separatorIdx).trim();
-      eventName = StringWrapper.substring(eventConfig, separatorIdx + 1).trim();
-      isLongForm = true;
-    }
-    return new EventConfig(fieldName, eventName, isLongForm);
-  }
-
-  getFullName(): string {
-    return this.isLongForm ? `${this.fieldName}${EVENT_TARGET_SEPARATOR}${this.eventName}` :
-                             this.eventName;
-  }
-}
-
 // Attention: This is on the hot path, so don't use closures or default values!
 export function queryBoundElements(templateContent: Node, isSingleElementChild: boolean):
     Element[] {
diff --git a/modules/angular2/src/core/render/dom/view/proto_view_builder.ts b/modules/angular2/src/core/render/dom/view/proto_view_builder.ts
index cac570c5e7..f9cb9cd3e8 100644
--- a/modules/angular2/src/core/render/dom/view/proto_view_builder.ts
+++ b/modules/angular2/src/core/render/dom/view/proto_view_builder.ts
@@ -34,12 +34,8 @@ import {
   PropertyBindingType
 } from '../../api';
 
-import {
-  NG_BINDING_CLASS,
-  EVENT_TARGET_SEPARATOR,
-  queryBoundTextNodeIndices,
-  camelCaseToDashCase
-} from '../util';
+import {NG_BINDING_CLASS, queryBoundTextNodeIndices, camelCaseToDashCase} from '../util';
+import {EVENT_TARGET_SEPARATOR} from "../../event_config";
 
 export class ProtoViewBuilder {
   variableBindings: Map<string, string> = new Map();
diff --git a/modules/angular2/src/core/render/event_config.ts b/modules/angular2/src/core/render/event_config.ts
new file mode 100644
index 0000000000..618c7986b1
--- /dev/null
+++ b/modules/angular2/src/core/render/event_config.ts
@@ -0,0 +1,23 @@
+import {StringWrapper} from 'angular2/src/core/facade/lang';
+export const EVENT_TARGET_SEPARATOR = ':';
+
+export class EventConfig {
+  constructor(public fieldName: string, public eventName: string, public isLongForm: boolean) {}
+
+  static parse(eventConfig: string): EventConfig {
+    var fieldName = eventConfig, eventName = eventConfig, isLongForm = false;
+    var separatorIdx = eventConfig.indexOf(EVENT_TARGET_SEPARATOR);
+    if (separatorIdx > -1) {
+      // long format: 'fieldName: eventName'
+      fieldName = StringWrapper.substring(eventConfig, 0, separatorIdx).trim();
+      eventName = StringWrapper.substring(eventConfig, separatorIdx + 1).trim();
+      isLongForm = true;
+    }
+    return new EventConfig(fieldName, eventName, isLongForm);
+  }
+
+  getFullName(): string {
+    return this.isLongForm ? `${this.fieldName}${EVENT_TARGET_SEPARATOR}${this.eventName}` :
+                             this.eventName;
+  }
+}
diff --git a/modules/angular2/src/web_workers/debug_tools/multi_client_server_message_bus.dart b/modules/angular2/src/web_workers/debug_tools/multi_client_server_message_bus.dart
new file mode 100644
index 0000000000..8303232bb5
--- /dev/null
+++ b/modules/angular2/src/web_workers/debug_tools/multi_client_server_message_bus.dart
@@ -0,0 +1,216 @@
+library angular2.src.web_workers.debug_tools.multi_client_server_message_bus;
+
+import "package:angular2/src/web_workers/shared/message_bus.dart"
+    show MessageBus, MessageBusSink, MessageBusSource;
+import 'dart:io';
+import 'dart:convert' show JSON;
+import 'dart:async';
+import 'package:angular2/src/core/facade/async.dart' show EventEmitter;
+import 'package:angular2/src/web_workers/shared/messaging_api.dart';
+
+// TODO(jteplitz602): Remove hard coded result type and
+// clear messageHistory once app is done with it #3859
+class MultiClientServerMessageBus implements MessageBus {
+  final MultiClientServerMessageBusSink sink;
+  MultiClientServerMessageBusSource source;
+  bool hasPrimary = false;
+
+  MultiClientServerMessageBus(this.sink, this.source);
+
+  MultiClientServerMessageBus.fromHttpServer(HttpServer server)
+      : sink = new MultiClientServerMessageBusSink() {
+    source = new MultiClientServerMessageBusSource(resultReceived);
+    server.listen((HttpRequest request) {
+      if (request.uri.path == "/ws") {
+        WebSocketTransformer.upgrade(request).then((WebSocket socket) {
+          var wrapper = new WebSocketWrapper(
+              sink.messageHistory, sink.resultMarkers, socket);
+          if (!hasPrimary) {
+            wrapper.setPrimary(true);
+            hasPrimary = true;
+          }
+          sink.addConnection(wrapper);
+          source.addConnection(wrapper);
+
+          wrapper.stream.listen(null, onDone: _handleDisconnect(wrapper));
+        });
+      }
+    });
+  }
+
+  void resultReceived() {
+    sink.resultReceived();
+  }
+
+  EventEmitter from(String channel) {
+    return source.from(channel);
+  }
+
+  EventEmitter to(String channel) {
+    return sink.to(channel);
+  }
+
+  Function _handleDisconnect(WebSocketWrapper wrapper) {
+    return () {
+      sink.removeConnection(wrapper);
+      if (wrapper.isPrimary) {
+        hasPrimary = false;
+      }
+    };
+  }
+}
+
+class WebSocketWrapper {
+  WebSocket socket;
+  Stream stream;
+  int _numResultsReceived = 0;
+  bool _isPrimary = false;
+  bool caughtUp = false;
+  List<String> _messageHistory;
+  List<int> _resultMarkers;
+
+  WebSocketWrapper(this._messageHistory, this._resultMarkers, this.socket) {
+    stream = socket.asBroadcastStream();
+    stream.listen((encodedMessage) {
+      var message = JSON.decode(encodedMessage)['message'];
+      if (message is Map && message.containsKey("type")) {
+        if (message['type'] == 'result') {
+          resultReceived();
+        }
+      }
+    });
+  }
+
+  bool get isPrimary => _isPrimary;
+
+  void resultReceived() {
+    if (!isPrimary && !caughtUp) {
+      _numResultsReceived++;
+      sendToMarker(_numResultsReceived);
+    }
+  }
+
+  void setPrimary(bool primary) {
+    _isPrimary = primary;
+    if (primary) {
+      caughtUp = true;
+    }
+  }
+
+  // Sends up to the given result marker
+  void sendToMarker(int markerIndex) {
+    int numMessages;
+    int curr;
+    if (markerIndex >= _resultMarkers.length) {
+      // we're past the final result marker so send all messages in history
+      curr = (_resultMarkers.length > 0)
+          ? _resultMarkers[_resultMarkers.length - 1]
+          : 0;
+      numMessages = _messageHistory.length - curr;
+      caughtUp = true;
+    } else {
+      curr = (markerIndex == 0) ? 0 : _resultMarkers[markerIndex - 1];
+      var end = _resultMarkers[markerIndex];
+      numMessages = end - curr;
+    }
+    while (numMessages > 0) {
+      socket.add(_messageHistory[curr]);
+      curr++;
+      numMessages--;
+    }
+  }
+}
+
+class MultiClientServerMessageBusSink implements MessageBusSink {
+  final List<String> messageHistory = new List<String>();
+  final Set<WebSocketWrapper> openConnections = new Set<WebSocketWrapper>();
+  final Map<String, EventEmitter> _channels = new Map<String, EventEmitter>();
+  final List<int> resultMarkers = new List<int>();
+
+  void resultReceived() {
+    resultMarkers.add(messageHistory.length);
+  }
+
+  void addConnection(WebSocketWrapper webSocket) {
+    openConnections.add(webSocket);
+    // send messages up to the first result marker to this socket
+    webSocket.sendToMarker(0);
+  }
+
+  void removeConnection(WebSocketWrapper webSocket) {
+    openConnections.remove(webSocket);
+  }
+
+  EventEmitter to(String channel) {
+    if (_channels.containsKey(channel)) {
+      return _channels[channel];
+    } else {
+      var emitter = new EventEmitter();
+      emitter.listen((message) {
+        _send({'channel': channel, 'message': message});
+      });
+      return emitter;
+    }
+  }
+
+  void _send(dynamic message) {
+    String encodedMessage = JSON.encode(message);
+    openConnections.forEach((WebSocketWrapper webSocket) {
+      if (webSocket.caughtUp) {
+        webSocket.socket.add(encodedMessage);
+      }
+    });
+    messageHistory.add(encodedMessage);
+  }
+}
+
+class MultiClientServerMessageBusSource implements MessageBusSource {
+  final Map<String, EventEmitter> _channels = new Map<String, EventEmitter>();
+  Function onResultReceived;
+
+  MultiClientServerMessageBusSource(this.onResultReceived);
+
+  EventEmitter from(String channel) {
+    if (_channels.containsKey(channel)) {
+      return _channels[channel];
+    } else {
+      var emitter = new EventEmitter();
+      _channels[channel] = emitter;
+      return emitter;
+    }
+  }
+
+  void addConnection(WebSocketWrapper webSocket) {
+    if (webSocket.isPrimary) {
+      webSocket.stream.listen((encodedMessage) {
+        var decodedMessage = decodeMessage(encodedMessage);
+        var channel = decodedMessage['channel'];
+        var message = decodedMessage['message'];
+        if (message is Map && message.containsKey("type")) {
+          if (message['type'] == 'result') {
+            // tell the bus that a result was received on the primary
+            onResultReceived();
+          }
+        }
+
+        if (_channels.containsKey(channel)) {
+          _channels[channel].add(message);
+        }
+      });
+    } else {
+      webSocket.stream.listen((encodedMessage) {
+        // handle events from non-primary browser
+        var decodedMessage = decodeMessage(encodedMessage);
+        var channel = decodedMessage['channel'];
+        var message = decodedMessage['message'];
+        if (_channels.containsKey(EVENT_CHANNEL) && channel == EVENT_CHANNEL) {
+          _channels[channel].add(message);
+        }
+      });
+    }
+  }
+
+  Map<String, dynamic> decodeMessage(dynamic message) {
+    return JSON.decode(message);
+  }
+}
diff --git a/modules/angular2/src/web_workers/debug_tools/single_client_server_message_bus.dart b/modules/angular2/src/web_workers/debug_tools/single_client_server_message_bus.dart
new file mode 100644
index 0000000000..ceee149203
--- /dev/null
+++ b/modules/angular2/src/web_workers/debug_tools/single_client_server_message_bus.dart
@@ -0,0 +1,140 @@
+library angular2.src.web_workers.debug_tools.single_client_server_message_bus;
+
+import "package:angular2/src/web_workers/shared/message_bus.dart"
+    show MessageBus, MessageBusSink, MessageBusSource;
+import 'dart:io';
+import 'dart:convert' show JSON;
+import 'dart:async';
+import "package:angular2/src/core/facade/async.dart" show EventEmitter;
+
+class SingleClientServerMessageBus implements MessageBus {
+  final SingleClientServerMessageBusSink sink;
+  SingleClientServerMessageBusSource source;
+  bool connected = false;
+
+  SingleClientServerMessageBus(this.sink, this.source);
+
+  SingleClientServerMessageBus.fromHttpServer(HttpServer server)
+      : sink = new SingleClientServerMessageBusSink() {
+    source = new SingleClientServerMessageBusSource();
+    server.listen((HttpRequest request) {
+      if (request.uri.path == "/ws") {
+        if (!connected) {
+          WebSocketTransformer.upgrade(request).then((WebSocket socket) {
+            sink.setConnection(socket);
+
+            var stream = socket.asBroadcastStream();
+            source.setConnectionFromStream(stream);
+            stream.listen(null, onDone: _handleDisconnect);
+          }).catchError((error) {
+            throw error;
+            connected = false;
+          });
+          connected = true;
+        } else {
+          // refuse additional clients
+          request.response.statusCode = HttpStatus.SERVICE_UNAVAILABLE;
+          request.response.write("Maximum number of clients connected.");
+          request.response.close();
+        }
+      }
+    });
+  }
+
+  void _handleDisconnect() {
+    sink.removeConnection();
+    source.removeConnection();
+    connected = false;
+  }
+
+  EventEmitter from(String channel) {
+    return source.from(channel);
+  }
+
+  EventEmitter to(String channel) {
+    return sink.to(channel);
+  }
+}
+
+class SingleClientServerMessageBusSink implements MessageBusSink {
+  final List<String> _messageBuffer = new List<String>();
+  WebSocket _socket = null;
+  final Map<String, EventEmitter> _channels = new Map<String, EventEmitter>();
+
+  void setConnection(WebSocket webSocket) {
+    _socket = webSocket;
+    _sendBufferedMessages();
+  }
+
+  EventEmitter to(String channel) {
+    if (_channels.containsKey(channel)) {
+      return _channels[channel];
+    } else {
+      var emitter = new EventEmitter();
+      emitter.listen((message) {
+        _send({'channel': channel, 'message': message});
+      });
+      return emitter;
+    }
+  }
+
+  void removeConnection() {
+    _socket = null;
+  }
+
+  void _send(dynamic message) {
+    String encodedMessage = JSON.encode(message);
+    if (_socket != null) {
+      _socket.add(encodedMessage);
+    } else {
+      _messageBuffer.add(encodedMessage);
+    }
+  }
+
+  void _sendBufferedMessages() {
+    _messageBuffer.forEach((message) => _socket.add(message));
+    _messageBuffer.clear();
+  }
+}
+
+class SingleClientServerMessageBusSource implements MessageBusSource {
+  final Map<String, EventEmitter> _channels = new Map<String, EventEmitter>();
+  Stream _stream;
+
+  SingleClientServerMessageBusSource();
+
+  EventEmitter from(String channel) {
+    if (_channels.containsKey(channel)) {
+      return _channels[channel];
+    } else {
+      var emitter = new EventEmitter();
+      _channels[channel] = emitter;
+      return emitter;
+    }
+  }
+
+  void setConnectionFromWebSocket(WebSocket socket) {
+    setConnectionFromStream(socket.asBroadcastStream());
+  }
+
+  void setConnectionFromStream(Stream stream) {
+    _stream = stream;
+    _stream.listen((encodedMessage) {
+      var decodedMessage = decodeMessage(encodedMessage);
+      var channel = decodedMessage['channel'];
+      var message = decodedMessage['message'];
+
+      if (_channels.containsKey(channel)) {
+        _channels[channel].add(message);
+      }
+    });
+  }
+
+  void removeConnection() {
+    _stream = null;
+  }
+
+  Map<String, dynamic> decodeMessage(dynamic message) {
+    return JSON.decode(message);
+  }
+}
diff --git a/modules/angular2/src/web_workers/debug_tools/web_socket_message_bus.dart b/modules/angular2/src/web_workers/debug_tools/web_socket_message_bus.dart
new file mode 100644
index 0000000000..6f47cc1bd0
--- /dev/null
+++ b/modules/angular2/src/web_workers/debug_tools/web_socket_message_bus.dart
@@ -0,0 +1,78 @@
+library angular2.src.web_workers.worker.web_socket_message_bus;
+
+import 'dart:html';
+import 'dart:convert' show JSON;
+import "package:angular2/src/web_workers/shared/message_bus.dart"
+    show MessageBus, MessageBusSink, MessageBusSource;
+import 'package:angular2/src/core/facade/async.dart' show EventEmitter;
+
+class WebSocketMessageBus implements MessageBus {
+  final WebSocketMessageBusSink sink;
+  final WebSocketMessageBusSource source;
+
+  WebSocketMessageBus(this.sink, this.source);
+
+  WebSocketMessageBus.fromWebSocket(WebSocket webSocket)
+      : sink = new WebSocketMessageBusSink(webSocket),
+        source = new WebSocketMessageBusSource(webSocket);
+
+  EventEmitter from(String channel) {
+    return source.from(channel);
+  }
+
+  EventEmitter to(String channel) {
+    return sink.to(channel);
+  }
+}
+
+class WebSocketMessageBusSink implements MessageBusSink {
+  final WebSocket _webSocket;
+  final Map<String, EventEmitter> _channels = new Map<String, EventEmitter>();
+
+  WebSocketMessageBusSink(this._webSocket);
+
+  EventEmitter to(String channel) {
+    if (_channels.containsKey(channel)) {
+      return _channels[channel];
+    } else {
+      var emitter = new EventEmitter();
+      emitter.listen((message) {
+        _send({'channel': channel, 'message': message});
+      });
+      _channels[channel] = emitter;
+      return emitter;
+    }
+  }
+
+  void _send(message) {
+    _webSocket.send(JSON.encode(message));
+  }
+}
+
+class WebSocketMessageBusSource implements MessageBusSource {
+  final Map<String, EventEmitter> _channels = new Map<String, EventEmitter>();
+
+  WebSocketMessageBusSource(WebSocket webSocket) {
+    webSocket.onMessage.listen((MessageEvent encodedMessage) {
+      var message = decodeMessage(encodedMessage.data);
+      var channel = message['channel'];
+      if (_channels.containsKey(channel)) {
+        _channels[channel].add(message['message']);
+      }
+    });
+  }
+
+  EventEmitter from(String channel) {
+    if (_channels.containsKey(channel)) {
+      return _channels[channel];
+    } else {
+      var emitter = new EventEmitter();
+      _channels[channel] = emitter;
+      return emitter;
+    }
+  }
+
+  Map<String, dynamic> decodeMessage(dynamic message) {
+    return JSON.decode(message);
+  }
+}
diff --git a/modules/angular2/src/web_workers/shared/client_message_broker.ts b/modules/angular2/src/web_workers/shared/client_message_broker.ts
index 9813fd3e2a..ede2897b4d 100644
--- a/modules/angular2/src/web_workers/shared/client_message_broker.ts
+++ b/modules/angular2/src/web_workers/shared/client_message_broker.ts
@@ -11,7 +11,7 @@ import {
 import {ListWrapper, StringMapWrapper, MapWrapper} from "angular2/src/core/facade/collection";
 import {Serializer} from "angular2/src/web_workers/shared/serializer";
 import {Injectable} from "angular2/di";
-import {Type} from "angular2/src/core/facade/lang";
+import {Type, StringWrapper} from "angular2/src/core/facade/lang";
 
 @Injectable()
 export class ClientMessageBrokerFactory {
@@ -90,10 +90,10 @@ export class ClientMessageBroker {
   private _handleMessage(message: StringMap<string, any>): void {
     var data = new MessageData(message);
     // TODO(jteplitz602): replace these strings with messaging constants #3685
-    if (data.type === "result" || data.type === "error") {
+    if (StringWrapper.equals(data.type, "result") || StringWrapper.equals(data.type, "error")) {
       var id = data.id;
       if (this._pending.has(id)) {
-        if (data.type === "result") {
+        if (StringWrapper.equals(data.type, "result")) {
           this._pending.get(id).resolve(data.value);
         } else {
           this._pending.get(id).reject(data.value, null);
diff --git a/modules/angular2/src/web_workers/shared/isolate_message_bus.dart b/modules/angular2/src/web_workers/shared/isolate_message_bus.dart
index 87325f8c37..6132158743 100644
--- a/modules/angular2/src/web_workers/shared/isolate_message_bus.dart
+++ b/modules/angular2/src/web_workers/shared/isolate_message_bus.dart
@@ -51,7 +51,7 @@ class IsolateMessageBusSource extends MessageBusSource {
   IsolateMessageBusSource(ReceivePort port)
       : rawDataStream = port.asBroadcastStream() {
     rawDataStream.listen((message) {
-      if (message is SendPort){
+      if (message is SendPort) {
         return;
       }
 
diff --git a/modules/angular2/src/web_workers/ui/setup.ts b/modules/angular2/src/web_workers/ui/setup.ts
index 7c4c15d800..9e06877f89 100644
--- a/modules/angular2/src/web_workers/ui/setup.ts
+++ b/modules/angular2/src/web_workers/ui/setup.ts
@@ -3,6 +3,7 @@ import {EventEmitter, ObservableWrapper} from 'angular2/src/core/facade/async';
 import {MessageBus} from 'angular2/src/web_workers/shared/message_bus';
 import {AnchorBasedAppRootUrl} from 'angular2/src/core/services/anchor_based_app_root_url';
 import {Injectable} from 'angular2/di';
+import {StringWrapper} from 'angular2/src/core/facade/lang';
 
 @Injectable()
 export class WebWorkerSetup {
@@ -12,7 +13,7 @@ export class WebWorkerSetup {
     var source = bus.from(SETUP_CHANNEL);
 
     ObservableWrapper.subscribe(source, (message: string) => {
-      if (message === "ready") {
+      if (StringWrapper.equals(message, "ready")) {
         ObservableWrapper.callNext(sink, {"rootUrl": rootUrl});
       }
     });
diff --git a/modules/angular2/src/web_workers/worker/application_common.ts b/modules/angular2/src/web_workers/worker/application_common.ts
index 0aa8ec3928..5e313f94c4 100644
--- a/modules/angular2/src/web_workers/worker/application_common.ts
+++ b/modules/angular2/src/web_workers/worker/application_common.ts
@@ -24,9 +24,9 @@ import {
   defaultKeyValueDiffers
 } from 'angular2/src/core/change_detection/change_detection';
 import {DEFAULT_PIPES} from 'angular2/pipes';
-import {StyleUrlResolver} from 'angular2/src/core/render/dom/compiler/style_url_resolver';
 import {ExceptionHandler} from 'angular2/src/core/exception_handler';
 import {DirectiveResolver} from 'angular2/src/core/compiler/directive_resolver';
+import {StyleUrlResolver} from 'angular2/src/core/render/dom/compiler/style_url_resolver';
 import {PipeResolver} from 'angular2/src/core/compiler/pipe_resolver';
 import {ViewResolver} from 'angular2/src/core/compiler/view_resolver';
 import {List, ListWrapper} from 'angular2/src/core/facade/collection';
@@ -42,7 +42,6 @@ import {
   ComponentRef,
   DynamicComponentLoader
 } from 'angular2/src/core/compiler/dynamic_component_loader';
-import {Testability} from 'angular2/src/core/testability/testability';
 import {AppViewPool, APP_VIEW_POOL_CAPACITY} from 'angular2/src/core/compiler/view_pool';
 import {AppViewManager} from 'angular2/src/core/compiler/view_manager';
 import {AppViewManagerUtils} from 'angular2/src/core/compiler/view_manager_utils';
@@ -51,7 +50,6 @@ import {ProtoViewFactory} from 'angular2/src/core/compiler/proto_view_factory';
 import {WebWorkerRenderer, WebWorkerCompiler} from './renderer';
 import {Renderer, RenderCompiler} from 'angular2/src/core/render/api';
 import {internalView} from 'angular2/src/core/compiler/view_ref';
-
 import {ClientMessageBrokerFactory} from 'angular2/src/web_workers/shared/client_message_broker';
 import {MessageBus} from 'angular2/src/web_workers/shared/message_bus';
 import {APP_COMPONENT_REF_PROMISE, APP_COMPONENT} from 'angular2/src/core/application_tokens';
@@ -125,6 +123,8 @@ function _injectorBindings(appComponentType, bus: MessageBus, initData: StringMa
     bind(KeyValueDiffers).toValue(defaultKeyValueDiffers),
     bind(ChangeDetection).toValue(bestChangeDetection),
     DirectiveResolver,
+    UrlResolver,
+    StyleUrlResolver,
     PipeResolver,
     Parser,
     Lexer,
@@ -132,10 +132,7 @@ function _injectorBindings(appComponentType, bus: MessageBus, initData: StringMa
     WebWorkerXHRImpl,
     bind(XHR).toAlias(WebWorkerXHRImpl),
     ComponentUrlMapper,
-    UrlResolver,
-    StyleUrlResolver,
     DynamicComponentLoader,
-    Testability,
     bind(AppRootUrl).toValue(new AppRootUrl(initData['rootUrl'])),
     WebWorkerEventDispatcher
   ];
diff --git a/modules/angular2/test/core/render/dom/util_spec.ts b/modules/angular2/test/core/render/event_config_spec.ts
similarity index 94%
rename from modules/angular2/test/core/render/dom/util_spec.ts
rename to modules/angular2/test/core/render/event_config_spec.ts
index f8b6b92a76..cce4de8dad 100644
--- a/modules/angular2/test/core/render/dom/util_spec.ts
+++ b/modules/angular2/test/core/render/event_config_spec.ts
@@ -1,4 +1,4 @@
-import {EventConfig} from 'angular2/src/core/render/dom/util';
+import {EventConfig} from 'angular2/src/core/render/event_config';
 import {ddescribe, describe, expect, it} from 'angular2/test_lib';
 
 export function main() {
diff --git a/modules/angular2/test/web_workers/debug_tools/message_bus_common.dart b/modules/angular2/test/web_workers/debug_tools/message_bus_common.dart
new file mode 100644
index 0000000000..4c7c0cc994
--- /dev/null
+++ b/modules/angular2/test/web_workers/debug_tools/message_bus_common.dart
@@ -0,0 +1,23 @@
+library angular2.test.web_workers.debug_tools.message_bus_common;
+
+import "dart:convert" show JSON;
+import "package:angular2/src/web_workers/shared/message_bus.dart";
+import "package:angular2/test_lib.dart"
+    show AsyncTestCompleter, expect, SpyObject;
+
+var MESSAGE = const {'test': 10};
+const CHANNEL = "TEST_CHANNEL";
+
+void expectSinkSendsEncodedJson(SpyObject socket, MessageBusSink sink,
+    String sendMethodName, AsyncTestCompleter async) {
+  socket.spy(sendMethodName).andCallFake((message) {
+    expectMessageEquality(message, MESSAGE, CHANNEL);
+    async.done();
+  });
+  sink.to(CHANNEL).add(MESSAGE);
+}
+
+void expectMessageEquality(String message, Map expectedData, String channel) {
+  expect(JSON.decode(message))
+      .toEqual({'channel': channel, 'message': expectedData});
+}
diff --git a/modules/angular2/test/web_workers/debug_tools/multi_client_server_message_bus.server.spec.dart b/modules/angular2/test/web_workers/debug_tools/multi_client_server_message_bus.server.spec.dart
new file mode 100644
index 0000000000..561efbfcbd
--- /dev/null
+++ b/modules/angular2/test/web_workers/debug_tools/multi_client_server_message_bus.server.spec.dart
@@ -0,0 +1,223 @@
+library angular2.test.web_workers.debug_tools.multi_client_server_message_bus;
+
+import "dart:io";
+import "dart:async";
+import "package:angular2/test_lib.dart"
+    show
+        AsyncTestCompleter,
+        inject,
+        describe,
+        it,
+        expect,
+        beforeEach,
+        createTestInjector,
+        beforeEachBindings,
+        SpyObject,
+        proxy;
+import "package:angular2/src/web_workers/debug_tools/multi_client_server_message_bus.dart";
+import "package:angular2/src/web_workers/shared/messaging_api.dart";
+import "./message_bus_common.dart";
+import "./spy_web_socket.dart";
+import "dart:convert" show JSON;
+import 'dart:math';
+
+main() {
+  List<String> messageHistory = new List<String>();
+  List<int> resultMarkers = new List<int>();
+  describe("MultiClientServerMessageBusSink", () {
+    const CHANNEL = "TEST_CHANNEL";
+    var MESSAGE = const {'test': 10};
+
+    beforeEach(() {
+      messageHistory.clear();
+      resultMarkers.clear();
+    });
+
+    it(
+        "should send messages to all connected clients",
+        inject([AsyncTestCompleter], (async) {
+          const NUM_CLIENTS = 5;
+          var sink = new MultiClientServerMessageBusSink();
+          int numMessagesSent = 0;
+          // initialize all the sockets
+          var sockets = new List<WebSocketWrapper>(NUM_CLIENTS);
+          for (var i = 0; i < sockets.length; i++) {
+            var messageSent =
+                false; // ensure this socket only receives one message
+            var socketWrapper = createSocket(messageHandler: (message) {
+              expect(messageSent).toEqual(false);
+              messageSent = true;
+              expectMessageEquality(message, MESSAGE, CHANNEL);
+              numMessagesSent++;
+              if (numMessagesSent == NUM_CLIENTS) {
+                async.done();
+              }
+            });
+            var socket = socketWrapper.socket;
+            sockets[i] =
+                new WebSocketWrapper(messageHistory, resultMarkers, socket);
+            sink.addConnection(sockets[i]);
+          }
+          sink.to(CHANNEL).add(MESSAGE);
+        }));
+  });
+
+  describe("WebSocketWrapper", () {
+    beforeEach(() {
+      messageHistory.clear();
+      resultMarkers.clear();
+    });
+
+    /**
+     * Generates the given number of random messages, inserts them into messageHistory,
+     * and then returns a cloned version of messageHistory
+     */
+    List<String> generateRandomMessages(int numMessages) {
+      const MAX = 1 << 31;
+      var random = new Random();
+      for (var i = 0; i < numMessages; i++) {
+        var message = {'value': random.nextInt(MAX)};
+        messageHistory
+            .add(JSON.encode({'channel': CHANNEL, 'message': message}));
+      }
+      // copy the message history to ensure the test fails if the wrapper modifies the list
+      return new List.from(messageHistory);
+    }
+
+    it(
+        "should send all messages when there are no markers",
+        inject([AsyncTestCompleter], (async) {
+          const NUM_MESSAGES = 10;
+          var messageHistoryClone = generateRandomMessages(NUM_MESSAGES);
+
+          int numMessagesSent = 0;
+          var socketWrapper = createSocket(messageHandler: (message) {
+            expect(message).toEqual(messageHistoryClone[numMessagesSent]);
+            //expectMessageEquality(message, expected, CHANNEL);
+            numMessagesSent++;
+            if (numMessagesSent == messageHistoryClone.length) {
+              async.done();
+            }
+          });
+          var wrapper = new WebSocketWrapper(
+              messageHistory, resultMarkers, socketWrapper.socket);
+          wrapper.sendToMarker(0);
+        }));
+
+    it(
+        "should send between two markers",
+        inject([AsyncTestCompleter], (async) {
+          const NUM_MESSAGES = 50;
+          const FIRST_MARKER = 5;
+          const SECOND_MARKER = 15;
+          var messageHistoryClone = generateRandomMessages(NUM_MESSAGES);
+
+          int numMessagesSent = 0;
+          resultMarkers.add(FIRST_MARKER);
+          resultMarkers.add(SECOND_MARKER);
+          var socketWrapper = createSocket(messageHandler: (message) {
+            expect(message)
+                .toEqual(messageHistoryClone[FIRST_MARKER + numMessagesSent]);
+            numMessagesSent++;
+            if (numMessagesSent == SECOND_MARKER - FIRST_MARKER) {
+              async.done();
+            }
+          });
+          var wrapper = new WebSocketWrapper(
+              messageHistory, resultMarkers, socketWrapper.socket);
+          wrapper.sendToMarker(1);
+        }));
+  });
+
+  describe("MultiClientServerMessageBusSource", () {
+    beforeEach(() {
+      messageHistory.clear();
+      resultMarkers.clear();
+    });
+
+    void sendMessage(StreamController controller, dynamic message) {
+      controller.add(JSON.encode(message));
+    }
+
+    void testForwardingMessages(bool primary, bool events, Function done) {
+      var result = createSocket();
+      var controller = result.controller;
+      var socket =
+          new WebSocketWrapper(messageHistory, resultMarkers, result.socket);
+      socket.setPrimary(primary);
+
+      var source = new MultiClientServerMessageBusSource(null);
+      source.addConnection(socket);
+
+      var channel = events ? EVENT_CHANNEL : CHANNEL;
+      source.from(channel).listen((message) {
+        expect(message).toEqual(MESSAGE);
+        done();
+      });
+
+      var message = {'channel': channel, 'message': MESSAGE};
+      sendMessage(controller, message);
+    }
+
+    it(
+        "should forward messages from the primary",
+        inject([AsyncTestCompleter], (async) {
+          testForwardingMessages(true, false, async.done);
+        }));
+
+    it(
+        "should forward event channel messages from non primaries",
+        inject([AsyncTestCompleter], (async) {
+          testForwardingMessages(false, true, async.done);
+        }));
+
+    it(
+        "should forward event channel messages from the primary",
+        inject([AsyncTestCompleter], (async) {
+          testForwardingMessages(true, true, async.done);
+        }));
+
+    it(
+        "should mark results from the primary",
+        inject([AsyncTestCompleter], (async) {
+          var result = createSocket();
+          var controller = result.controller;
+          var socket = new WebSocketWrapper(
+              messageHistory, resultMarkers, result.socket);
+          socket.setPrimary(true);
+
+          var source =
+              new MultiClientServerMessageBusSource(() => async.done());
+          source.addConnection(socket);
+
+          var message = {
+            'channel': CHANNEL,
+            'message': {'type': 'result'}
+          };
+          sendMessage(controller, message);
+        }));
+  });
+}
+
+/**
+ * Returns a new SpyWebSocket that calls messageHandler when a new message is sent.
+ * Also returns a StreamController instance that you can use to send messages to anything
+ * that is subscribed to this socket.
+ */
+SpySocketWrapper createSocket({Function messageHandler}) {
+  var socket = new SpyWebSocket();
+  if (messageHandler != null) {
+    socket.spy("add").andCallFake(messageHandler);
+  }
+
+  var controller = new StreamController<String>.broadcast();
+  socket.spy("asBroadcastStream").andCallFake(() => controller.stream);
+  return new SpySocketWrapper(socket, controller);
+}
+
+class SpySocketWrapper {
+  SpyWebSocket socket;
+  StreamController controller;
+
+  SpySocketWrapper(this.socket, this.controller);
+}
diff --git a/modules/angular2/test/web_workers/debug_tools/single_client_server_message_bus.server.spec.dart b/modules/angular2/test/web_workers/debug_tools/single_client_server_message_bus.server.spec.dart
new file mode 100644
index 0000000000..d53b7d97e9
--- /dev/null
+++ b/modules/angular2/test/web_workers/debug_tools/single_client_server_message_bus.server.spec.dart
@@ -0,0 +1,97 @@
+library angular2.test.web_workers.debug_tools.single_client_server_message_bus;
+
+import "dart:io";
+import "dart:async";
+import "package:angular2/test_lib.dart"
+    show
+        AsyncTestCompleter,
+        inject,
+        describe,
+        it,
+        expect,
+        beforeEach,
+        createTestInjector,
+        beforeEachBindings,
+        SpyObject,
+        proxy;
+import "package:angular2/src/web_workers/debug_tools/single_client_server_message_bus.dart";
+import "./message_bus_common.dart";
+import "./spy_web_socket.dart";
+import "dart:convert" show JSON;
+
+main() {
+  var MESSAGE = const {'test': 10};
+  const CHANNEL = "TEST_CHANNEL";
+  describe("SingleClientServerMessageBusSink", () {
+    it(
+        "should send JSON encoded data over the WebSocket",
+        inject([AsyncTestCompleter], (async) {
+          var socket = new SpyWebSocket();
+          var sink = new SingleClientServerMessageBusSink();
+          sink.setConnection(socket);
+          expectSinkSendsEncodedJson(socket, sink, "add", async);
+        }));
+
+    it(
+        "should buffer messages before connect",
+        inject([AsyncTestCompleter], (async) {
+          var sink = new SingleClientServerMessageBusSink();
+          sink.to(CHANNEL).add(MESSAGE);
+
+          var socket = new SpyWebSocket();
+          socket.spy("add").andCallFake((message) {
+            expectMessageEquality(message, MESSAGE, CHANNEL);
+            async.done();
+          });
+          sink.setConnection(socket);
+        }));
+
+    it(
+        "should buffer messages in between disconnect and connect",
+        inject([AsyncTestCompleter], (async) {
+          var SECOND_MESSAGE = const {'test': 12, 'second': 'hi'};
+          var sink = new SingleClientServerMessageBusSink();
+          sink.to(CHANNEL).add(MESSAGE);
+
+          var socket = new SpyWebSocket();
+          sink.setConnection(socket);
+
+          int numMessages = 0;
+
+          socket.spy("add").andCallFake((message) {
+            numMessages++;
+            if (numMessages == 1) {
+              expectMessageEquality(message, MESSAGE, CHANNEL);
+            } else {
+              expectMessageEquality(message, SECOND_MESSAGE, CHANNEL);
+              async.done();
+            }
+          });
+
+          sink.removeConnection();
+          sink.to(CHANNEL).add(SECOND_MESSAGE);
+          sink.setConnection(socket);
+        }));
+  });
+
+  describe("SingleClientServerMessageBusSource", () {
+    it(
+        "should decode JSON messages and emit them",
+        inject([AsyncTestCompleter], (async) {
+          var socket = new SpyWebSocket();
+          StreamController<String> controller =
+              new StreamController.broadcast();
+          socket.spy("asBroadcastStream").andCallFake(() => controller.stream);
+
+          var source = new SingleClientServerMessageBusSource();
+          source.setConnectionFromWebSocket(socket);
+          source.from(CHANNEL).listen((message) {
+            expect(message).toEqual(MESSAGE);
+            async.done();
+          });
+
+          controller
+              .add(JSON.encode({'channel': CHANNEL, 'message': MESSAGE}));
+        }));
+  });
+}
diff --git a/modules/angular2/test/web_workers/debug_tools/spy_web_socket.dart b/modules/angular2/test/web_workers/debug_tools/spy_web_socket.dart
new file mode 100644
index 0000000000..692945b078
--- /dev/null
+++ b/modules/angular2/test/web_workers/debug_tools/spy_web_socket.dart
@@ -0,0 +1,15 @@
+/**
+ * Contains code shared between all server message bus tests
+ */
+library angular2.test.web_workers.debug_tools.server_message_bus_common;
+
+import "package:angular2/test_lib.dart";
+import "dart:io";
+
+@proxy
+class SpyWebSocket extends SpyObject implements WebSocket {
+  SpyWebSocket() : super(SpyWebSocket);
+  noSuchMethod(m) {
+    return super.noSuchMethod(m);
+  }
+}
diff --git a/modules/angular2/test/web_workers/debug_tools/web_socket_message_bus_spec.dart b/modules/angular2/test/web_workers/debug_tools/web_socket_message_bus_spec.dart
new file mode 100644
index 0000000000..040ab05d17
--- /dev/null
+++ b/modules/angular2/test/web_workers/debug_tools/web_socket_message_bus_spec.dart
@@ -0,0 +1,72 @@
+library angular2.test.web_workers.debug_tools.web_socket_server_message_bus;
+
+import "package:angular2/test_lib.dart"
+    show
+        AsyncTestCompleter,
+        inject,
+        describe,
+        it,
+        expect,
+        beforeEach,
+        createTestInjector,
+        beforeEachBindings,
+        SpyObject,
+        proxy;
+import "package:angular2/src/web_workers/debug_tools/web_socket_message_bus.dart";
+import "dart:html" show WebSocket, MessageEvent;
+import "./message_bus_common.dart";
+import "dart:async";
+import "dart:convert" show JSON;
+
+main() {
+  var MESSAGE = const {'test': 10};
+  const CHANNEL = "TEST_CHANNEL";
+
+  describe("WebSocketMessageBusSink", () {
+    it(
+        "should send JSON encoded data over the WebSocket",
+        inject([AsyncTestCompleter], (async) {
+          var socket = new SpyWebSocket();
+          var sink = new WebSocketMessageBusSink(socket);
+          expectSinkSendsEncodedJson(socket, sink, "send", async);
+        }));
+  });
+
+  describe("WebSocketMessageBusSource", () {
+    it(
+        "should decode JSON messages and emit them",
+        inject([AsyncTestCompleter], (async) {
+          var socket = new SpyWebSocket();
+          StreamController<MessageEvent> controller =
+              new StreamController.broadcast();
+          socket.spy("get:onMessage").andCallFake(() => controller.stream);
+          var source = new WebSocketMessageBusSource(socket);
+
+          source.from(CHANNEL).listen((message) {
+            expect(message).toEqual(MESSAGE);
+            async.done();
+          });
+
+          var event = new SpyMessageEvent();
+          event.spy("get:data").andCallFake(
+              () => JSON.encode({'channel': CHANNEL, 'message': MESSAGE}));
+          controller.add(event);
+        }));
+  });
+}
+
+@proxy
+class SpyMessageEvent extends SpyObject implements MessageEvent {
+  SpyMessageEvent() : super(SpyMessageEvent);
+  noSuchMethod(m) {
+    return super.noSuchMethod(m);
+  }
+}
+
+@proxy
+class SpyWebSocket extends SpyObject implements WebSocket {
+  SpyWebSocket() : super(SpyWebSocket);
+  noSuchMethod(m) {
+    return super.noSuchMethod(m);
+  }
+}
diff --git a/modules/examples/src/web_workers/todo/index_common.ts b/modules/examples/src/web_workers/todo/index_common.ts
index 29571ad299..e415329e62 100644
--- a/modules/examples/src/web_workers/todo/index_common.ts
+++ b/modules/examples/src/web_workers/todo/index_common.ts
@@ -1,4 +1,6 @@
-import {NgFor, Component, View, FORM_DIRECTIVES} from 'angular2/angular2';
+import {NgFor} from 'angular2/src/core/directives/ng_for';
+import {View, Component} from 'angular2/src/core/metadata';
+import {FORM_DIRECTIVES} from 'angular2/src/forms/directives';
 import {Store, Todo, TodoFactory} from './services/TodoStore';
 
 @Component({selector: 'todo-app', viewBindings: [Store, TodoFactory]})
diff --git a/modules/examples/src/web_workers/todo/index_web_socket.dart b/modules/examples/src/web_workers/todo/index_web_socket.dart
new file mode 100644
index 0000000000..ad8548258a
--- /dev/null
+++ b/modules/examples/src/web_workers/todo/index_web_socket.dart
@@ -0,0 +1,16 @@
+library angular2.examples.web_workers.todo.index_web_socket;
+
+import "package:angular2/src/core/reflection/reflection_capabilities.dart";
+import "package:angular2/src/core/reflection/reflection.dart";
+import "package:angular2/src/web_workers/ui/impl.dart" show bootstrapUICommon;
+import "package:angular2/src/web_workers/debug_tools/web_socket_message_bus.dart";
+import 'dart:html'
+  show WebSocket;
+
+main() {
+  reflector.reflectionCapabilities = new ReflectionCapabilities();
+  var webSocket = new WebSocket("ws://127.0.0.1:1337/ws");
+  var bus = new WebSocketMessageBus.fromWebSocket(webSocket);
+
+  bootstrapUICommon(bus);
+}
diff --git a/modules/examples/src/web_workers/todo/index_web_socket.html b/modules/examples/src/web_workers/todo/index_web_socket.html
new file mode 100644
index 0000000000..a52efc9238
--- /dev/null
+++ b/modules/examples/src/web_workers/todo/index_web_socket.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html>
+  <title>Todo Angular 2 - WebWorker</title>
+  <link rel="stylesheet" href="css/main.css" media="screen" title="no title" charset="utf-8">
+<body>
+  <todo-app>
+    Loading...
+  </todo-app>
+
+
+  $SCRIPTS$
+</body>
+</html>
diff --git a/modules/examples/src/web_workers/todo/server_index.dart b/modules/examples/src/web_workers/todo/server_index.dart
new file mode 100644
index 0000000000..16150aaa5a
--- /dev/null
+++ b/modules/examples/src/web_workers/todo/server_index.dart
@@ -0,0 +1,16 @@
+library angular2.examples.web_workers.todo.server_index;
+import "index_common.dart" show TodoApp;
+import "package:angular2/src/web_workers/debug_tools/multi_client_server_message_bus.dart";
+import "package:angular2/src/web_workers/worker/application_common.dart"
+  show bootstrapWebWorkerCommon;
+import 'dart:io';
+import "package:angular2/src/core/reflection/reflection_capabilities.dart";
+import "package:angular2/src/core/reflection/reflection.dart";
+
+void main() {
+  reflector.reflectionCapabilities = new ReflectionCapabilities();
+  HttpServer.bind('127.0.0.1', 1337).then((HttpServer server) {
+    var bus = new MultiClientServerMessageBus.fromHttpServer(server);
+    bootstrapWebWorkerCommon(TodoApp, bus).catchError((error) => throw error);
+  });
+}
diff --git a/modules_dart/transform/lib/src/transform/template_compiler/reflection/model.dart b/modules_dart/transform/lib/src/transform/template_compiler/reflection/model.dart
index 51522ef045..7277ae8fc4 100644
--- a/modules_dart/transform/lib/src/transform/template_compiler/reflection/model.dart
+++ b/modules_dart/transform/lib/src/transform/template_compiler/reflection/model.dart
@@ -1,6 +1,7 @@
 library angular2.transform.template_compiler.reflection.model;
 
 import 'package:angular2/src/core/render/dom/util.dart';
+import 'package:angular2/src/core/render/event_config.dart';
 
 /// Defines the names of getters, setters, and methods which need to be
 /// available to Angular 2 via the `reflector` at runtime.