How to find out multiple instances of the same application

Hi,
Please help me with your Java Networking expertise.
Is there any way you could suggest where we could know how many instances of the same application is running in a network ?
Sending a UDP packet would require to specify the destination of the machine's IP address.
But when the same application is installed in two different machines, at run time both the instances should be able to communicate dynamically. Is there any way I can send a signal(packet) that should be picked up by the other application instance ? Both the machine are in the same network.
Thanks,
Deb

I guess there are many ways to do it. One simple way would be to broadcast a mesage whenever an instance starts up. Other running instances can then communicate back to it.

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Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
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