Make the Host computer function as a server. That means find your router, unplug the internet cable, plug your computer into it.
Then you go to the network settings, setup netork, and say that the other computers connect to the internet though your computer. Select the lan as the internet.
I can't test this (Don't have a power computer) but doing this does make your computer a server (Wireless 56k!!!! (I did test that))
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=ChrisB=: I hate n00bs, n00bs hate me! Lets get a gun and kill all the n00bies!!!