How do you connect three computers using an ethernet switch without an internet connection to play games?

For this type of connection you will need to use a *crossover* ethernet cable, not a standard patch cable. This will allow two computers to network with eachother. You can then use the network wizard (if you use Windows xp or vista) and choose to create a home network. You will need to assign each computer a unique IP address so they can find eachother, as well as a unique computer name.