PC Stats has posted a beginners guide about Internet Connection Sharing

Internet sharing is essential if you have more than one PC in your house, and getting it to work isn't that hard once you know what steps to follow. Setting up a computer to share its internet connection should be easy right? After all, you've successfully networked your computers together and even shared files with all your home computers, so why not the Internet? Well if you have a small home network of computers all connected and have tried to open up a browser, you've probably found out that things aren't quite as straight forward as connecting one machine with an Ethernet cable to the computer that has the DSL/cable modem. The secret is that everything comes down to having a gateway. A gateway is a computer or device than can route data between different networks. Put it this way, if your computers are on one network and every other computer connected to the Internet is on a different one, to pass information across network boundaries you need a device which is connected to both networks and equipped to decide whether information from one network should go out to the other network, and vice versa.

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