What OS's do yoy have on the two computers?
This is really a simple problem, but tougher than it looks.
Do you have to be able to be 'connected at the same time? You could just switch the cable back and forth fron one to the other, like I do! lol

But if you tell me the operating systems, I can tell you - so could most of us I think :O)

If one is WIN XP, your problems are over, but basically it is what forrest0177 said but winxp will run a wizard and you just have to assign the same domain names to all the computers.

(There may be an issue with printer functionality/access sneeking up here, to)