You need a pretty decent server pc machine. If you are playing on the same pc as the server is going to be thats fine but make shure that pc is pretty fast. You need some type of router, or switch so you can connect all the pc's together.
You need a place for all of the computers to be, a desk or table(s). You will need some cat5 networking cables as well. Enough outlets for the pc's to be plugged in.
Thats all you need, when you start the server depending on what game it is start the server as a lan server. Dedicated or non dedicated, it doesnt really matter.
Its not a complicated task, very easy.
Everyone has to have the same game of course.
Edited by jrm20, 19 January 2006 - 05:42 PM.