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Jackose,

On 6/4/2009 9:07 AM, Jackose wrote:
> Say for example, I have four clients and a server. If client1 sends the
> message "hi", the server receives the message "hi" and the server must send
> this "hi" message to clients1,2,3 & 4.

This isn't really how HTTP works. The clients always initiate the
requests, and the server fulfills them. Any web-based services that
appear to work otherwise are doing one of the following:

1. Clients are polling the server for messages (resource-intensive).
  (Think gmail)
or
2. Clients are themselves acting as servers, and the "server" is
   acting as a client.
   (Think web services)

There are some semi-standard ways to send messages like this using
publish/subscribe capabilities. Two such strategies that come to mind
are MQ (aka Java Message Service which is pub/sub using #2 above) and
RSS (which is polling a la #1 above).

- -chris
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