What operatign system are the computers running? If at least one of the computers has WinXP, you can use that computer to share the connection with the rest. In all of the computers, you will need a network card. You can buy these for like $9 or less. You will also need a hub or switch, preferrably a switch. This will cost about $15 to $20 for a 4 or 5 port model. The most expensive part is actally the cables, which are cat5 with RJ45 connectors. Connect all this together. hat's all you need as far as hardware. WinXP has built in connection sharing. i've never done it but know people who have. For details try searching
http://microsoft.com .If you don't have winxp there are plenty of probs whic hwill do connection sharing. win2000 may also have this capability but i don't really remember. As far as other operaing systems go i really don't know enough to say much. I hope this helps.