sorry, what i am asking is how the other computers access the game server. I think. I am horribly confused right now.
As long as all your computers have IP's that belong to the same broadcast domain, then your computers should be able to ping the game server. That, and gameservers send out multicast/broadcast packets to advertise the game server. So all you need are n
PC's using an Ethernet Network (RJ-45, Swtich, and some CAT5 cables). You can configure this one of two ways:
1) Local Only: No internet access.
2) Local with Internet.
The first one means that you can go and buy a cheap switch and cables, hook it up, set the IP's on all the clients to the same broadcast domain, configure the machines so they belong to the same WORKGROUP, and then setup your game server, create a local game, and you're set.
2) This one is a bit complicated, but not so much so. Todays routers, such as the Linksys BEFSR41, also functions as a DHCP server. So all you need to do is to plug in the computers to the switch on the back (maximum 4 PC's since there's only 4 ports) via Cat5 cables. Set the workgroup name to the same thing on all of them (default workgroup name for Windows is WORKGROUP), and start your gameserver. This is similar to the #1, where it's local only. If you want outsiders to game with you, you have to open up the respected ports for your games.
Really, it's not that hard at all. I have my own LAN at home and my friends just come in plug in their laptops and we're game. Same with my friends house too. Oh, and your question was a bit vague, I command you to ask better questions!!!!