Network help

Im not to good with some things on computers, and setting up a network is one of them ... I just havent needed to as someones always done it for me. So, I have a laptop running Vista and I get net through a wireless router. I also have an old XP machine that I want to store files on, but I want to be able to connect to the net through that, too. Is there a way I can hook up my laptop and desktop so the latter gets net access through the former?

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