It depends a bit on how far away from one another the computers are and on how portable you need the laptop to be. If the computers are in different rooms, or if you want the laptop to wander and still be networked, an wireless router near your main network connection (e.g. the modem to your ISP) is in order. If everything is together, you can use an ordinary router. If you set up a wireless network, be sure to use encryption to keep others from freeloading or getting into your stuff. Ethernet print servers are available for both USB and Centronics type printers. I have had bad luck with wireless print servers, but your situation may be different. I use the regular kind and plug them into the router or a hub. You can use either ethernet cables to the router or USB wireless adapters to connect the computers to the network. Where you have a concentration of equipment or where there are printers, you will usually want to use cables to either a hub or a router. The common wireless routers need to be plugged into an ethernet backbone. That is usually the DSL, fiber, or cable modem. That means that you generally can't use two wireless routers in your home network. But you can plug a hub or a regular router into a wireless range extender to achieve the same effect. Be careful about address conflicts with the range extender - the system may see both the extender and the wireless router and get confused unless you set things up carefully.