Nertworking

I want to develop a software which will enable users on a network running on windows operating system to chat with each other. Which java technology I can use to develop this software?
Please answer in detail.

We're going to need some more details. But if you just want a chat program, all you need is the java standard edition. A simple chat program would probably involve java.io, java.net, java.awt, and javax.swing. Of course if you want to make it more complex, there are some other considerations, but the above would work fine. Give us some more details though.

Thanks for your reply. I have few more question about it.
How computer are identified on a network running on windows operating system? As sockets require IP address, how I can use this to identify computer on a network?
Can I use RMI? If yes, how its URL can be used to access computer on network? Give an example URL identifying a any computer?

Please answer my questions. They should be very easy for u people. My networking is very weak so help me out.