How to push back a message to browser using JSP or Servlet?

Hi,
I am coding some JSP and Servlet codes, and want to push back a mssage to browser and don't let browser first send a request to server like chat. Who can help me for that?
Thanks,
Wise

You wrote:
Not quite correct - see Pushlets:I wrote:
"...to have code running on the client (eg an applet or a flash movie)"
I add "...(eg an applet or a flash movie OR JavaScript)..." ;-)

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