How can I detect arrival of data on socket?

I have written a bean which uses a (client) socket to send data to a socket server program. This works fine.
My problem is that I also want the bean to be able to detect the arrival of data on its socket without going into a read loop.
From what I have read, I think I need to set up some sort of a listener to trap this. Unfortunately, I have been unable to find a code example that I can figure out or looks useable.
Please bear in mind that my server program is written in another language.
Any suggestions?
Thanks in advance!

Well in Java you do something like this:
-create the serverSocket:
ServerSocket serverSocket = new ServerSocket(PORTNR);
- usually you put this line in a while(listening) loop:
Socket clientSocket = serverSocket.accept();
Once someone tries to connect to the socket the accept() method returns a Socket to the client. Usually you create a thread to take care of the client and then reloop and go back waiting at the accept() metod.
If you want help to do this in a different language, I guess you should specify which language, or perhaps find a forum for that language to ask.... (or do both)
Sjur

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