Network application

hi there,

i am developing an application (tictactoe) in vb.net. it is easy to have it as one player (to play with the system).
my question is that i want to increase the scope of this application so that two users can play against each others over a LAN for example.
Did anyone write an application that can accept input from users over a LAN or does someone have some resources and direct me to some so that i make my own research?

i will be really thankful for that.
thanks...

Look at the socket examples in vb.net 101 examples.

Here are a couple of classes you can use to do client server stuff with an example of how to use
http://www.vbforums.com/showthread.php?t=390875