setting up two computers for gaming?

hey, im going to a friends house this weekend and he just got another computer, he wanted to know if theres a way to set up the two computers to play head to head. if so, what do we need and how do we do it

 

you can connect the two computers with an ethernet cable and play locally but just know that youll need two copies of the game to do it

 

we have two copies, would i run the ethernet cable directly between the two computer or setup a router and run a cable to each computer

 

since its just 2 computers, you shouldn't need a router

 

If you are going to connect 2 comps directly without router then u should get a Cat5e crossover cable, works better i think