Java program to broadcast in LAN

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Java

LAN

Hi everyone,
I am developing a java application to use in LAN. In my app, one system will broadcast with one keyword, all other system will do something with that keyword and respond to the sender with the result
sender: Broadcast(keyword)
receiver systems: result=DoSomething(keyword), RespondToSender(result)

Here, sender is not a server.
Receiver may or may not be a server- broadcasting means message from sender will go to all systems in LAN( including server, other peer systems etc..)

And this application is meant for windows (currently in windows 7) system

How to do this broadcasting part,

Many thanks in advance...