| First, When you set up the router you are asked to give it an SSID name. This name will be how the router is listed in the available connections. I'm not sure how wireless works with W2K, but there should be an icon inthe try area that will allow you to see the network the PC is connected to and what networks are available. With XP you can set a default network so that they use your router instead of a neighbors.
Once you configure their PC so it uses your router, you should be able to then turn on File And Print Sharing (on both PCs) so you can access files in shared folders and access shared printers. You wil need to set your printer as shared. They will then need to install the drivers on their PC and add it as a network printer. | 
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