Co-Op for two ?[gaming question]

[televiisor607]

Hello. I'm kinda new on this forum and I would like to ask that does anyone know a good Co operation games For PC ? I would like to play some good games with my dad through LAN.Although he doesn't have a very good PC.
He has pixel shader 1.0. we already tried serious sam and completed it. are there any more ?:suprised:

 

[Petros]

http://www.osnn.net/pc-gaming/93557-list-co-op-games-pc-additions-welcome.html

Here you go! A lot of the older RPGs (diablo, Baldur's Gate 2) would work on his computer and make for some fun coop.

 

[televiisor607]

but do you know any games like SWAT 4 ? because he can run it on medium