A GWT client is a web page in a browser, which can't talk to another 
browser instance, because a browser can't listen on a socket, as far as I'm 
aware. So clients don't really have 'port numbers'.

I think that the right way to do what you want to do would be to have 
clients send messages to a server side queue which would store the messages 
until a client polled the server for messages addressed to that client.

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