Wes pretty well covered it. I am running two desktops and my laptop through the one modem. If you have newer computers you may have the wireless card built in. I use the Ethernet cable on my desktops as they are older and set right nest to the Linksys Router which has 4 inputs. The laptop has a built in wireless card and I can use it anywhere in the house. I don't even load any of the network software that came with the router and modem. You will need the wireless adapter only if your computers don't have it built in. I also like the wireless mice.
Ron
