There are 2 ways to do it, you can either keep one pc conncted to the internet like you have and cable the other pc to this pc using a crossover cable, or you can buy either a wired router with an intergrated 4-port switch and cable both pcs to the router using a straight through cable or you can buy a wireless router/switch for which you would need either a wireless network card or wireless usb adapter for your pc...
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