Doom Co-op

How can I play Doom Co-op? Me and my brother want to play on different computers offline in co-op mode. how do you do that? we dont want to play online just on your own pc's. what do i need?

Network your computers through a hub or router and play using an engine that allows TCP/IP connections (as most currently maintained source ports allow).

If you don't have hub or router, you could just connect the computers directly using a crossover cable.

alright thanks guys :)