peer to peer messaging

Hi! I want to write an application that will send a message to another
computer using Sockets. I've wrote a simple echo client server before
using Sockets but this application is different. I want to be able to
send a message to any other computer running this application. *** The
problem that I'm running into is that when setting up the socket, if
the computer is hooked up in a network, I know the IP address of the
router... somehow I have to be able to send it directly to the
computer... how can I do this? When a user uses the application, they
log in and if there is any information I can store on the server that
would help me do this, I can... any help would be great. Thanks!

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