Yes, basically the computer that is hooked up through the router. To find the right Ip Address to use, use the "ipconfig" method that I've explained here. The yellow light should then change to green. Also, the port range for Bittorrent (6881-6999) is the standard port range. With some clients (such as Bittornado), you can change which ports you want the client to use. I suggest just leaving it at the standard range. Hope I could help.