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First of all each computer must already have a network card, or they couldn't hook to teh internet...... unless your motherboard has a hookup built in. I expect what you really want is for all four computers to have internet access..... and be able to 'talk' to each other. What you need is a router, and enough cable to reach each computer...... depending how far they are apart it should cost around $100. Or you could go wireless but that would probally cost more. Networking them together is easy.
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