GWT Instnace Messaging 2

In the previous post I described a simple way to implement instant messaging using GWT, the technique was to use polling which every few seconds look for a new chat message.

However this technique is not efficient, I had found a better implementation which use "push" from the server to the client to implement the instant messaging.
You can read more about it at:

http://code.google.com/p/google-web-toolkit-incubator/wiki/ServerPushFAQ