There are many manufacturers of networking equipment who are eager to help you. The most popular and relatively consumer-friendly option is a network that runs over your home phone lines. A network is built, and it doesn't interfere with your phone calls. To add a third computer, you'll need to buy another box, as most starter kits only have equipment for connecting two machines. Also, if you have a mix of new and old machines, be sure you have the appropriate connections for all of them.
Most manufacturers offer either USB port, parallel port or internal card units.
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