Private Chat functionality for basic server

Dear all
Firstly i hope this is the best forum for my question.
I've written a basic chat server and client. The server recieves strings messages, and broadcasts them to everyone connected to it. I was wandering, sticking with exchanging Strings over the connection, what ways could I implement a private chat facility so one client could choose to send a message that would only be seen by one chosen user?
Dwarfer

Hi georgernc
I completly agree with you. I had originally used the smack api to create a client that talked with an openfire server, however was told (as i'm doing this to create an experiement for a project) that what i was writing was too 'heavy', as there was no need for using things like rooms and roosters) which to be honest is probably true.
So i went back to just writing a very basic server, with not authentication or security (i don't think i really need security as it will never be used outside of a closed network, and even then it will only be used for short periods of time) that just listens for a connection on serverSocket.accept(), reads from it when there is a message(String) arrives and then broadcast that mesage to all those connected to the server.
I'm not too sure how to progress in setting up the private chat facility without using smack and openfire (as i've been told not too). I'm going to get cracking and start playing around and see what i can come up...

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Thank you for your response Hironmay,
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I read on Nigel twitter feed that he hates private, and I can thank him for his love of protected members, because it made my job so much easier!
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