easiest setup is to put 1 nic in each computer and then connect them all with a router. If you have a broadband connection, a router will allow each computer to access the internet much easier. Wont have to have one computer on all the time.
Shouldnt have any problems with diff. os's
Just be sure to get a 10/100 nic card and you should be fine. linksys, d-ling, intel should work for you.
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