void registerNode(NodeAddress node, [bool allowremote=false, String workdir]) {
 //kregisterNode must not be called more than once
 if(NodeAddress._localhost != null) {
   throw new UnsupportedOperationError("Can only register node once");
 }

 // set local identification
 NodeAddress._localhost = node;
 
 // set path to where to store received files
 _workDirPath = (workdir == null) ? _getDefaultWorkDir() : workdir;
 
 // setup requesthandlers
 _RequestHandler.allow(_NETWORK_FILE_HANDLER);
 _RequestHandler.allow(_NETWORK_FILE_REQUEST_HANDLER);
 _RequestHandler.allow(_NETWORK_ISOLATE_DATA_HANDLER);
 
 if(allowremote){
   _RequestHandler.allow(_NETWORK_SPAWN_ISOLATE_HANDLER);
   _RequestHandler.allow(_NETWORK_SPAWN_RESPONSE_HANDLER);
 }
 
 // start listening for incomming requests
 _Network._initServer();
}

SendPort spawnUriRemote(String uri, NodeAddress node){
 var requestId = new _IsolateId();
 var rp = new ReceivePort();
 var buffer = new StreamController();
 rp.receive((msg,reply) => buffer.sink.add({'msg':msg,'reply':reply}));
 
 _RemoteProxy
   .subscribe(requestId)
   .then((_RemoteSendPort rsp){
     buffer.stream.listen((data){
       var msg = data['msg'];
       var sp = data['reply'];
       var local = new _LocalIsolate(sp);
       rsp.send(msg, local.toRemoteSendPort());
     });
   });
 
 
 _DartCodeDb.resolveDartProgram(uri).then((_DartProgram dp){
   new _spawnIsolateRequest(requestId,dp).sendTo(node);
 });

 return rp.toSendPort();
}