Search for comet. It's the closest technique to what you want.

JA wrote:
> Might be a silly question, but how do you make this scenario work
> efficiently:
>
> The client sends a message to the server, then displays the server
> status.  Now I'm expecting some other client to respond to my message
> at a later time, but I don't want to keep polling to see whether the
> server status has changed.  Is there a way for the server to call a
> procedure on the client when the second client has clicked?
>
> Thx.
>
>   

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