XP Pro Remote Dsktp TZO Linksys befsr41

This is my first time setting up remote desktop. I want to set up remote desktop between 2 pc’s. Both run W XP Pro. The office pc is behind the Linksys BEFSR41 router on a P2P network. I have the ip set to 192.168.1.50 for this machine.The home machine is not behind any router it connects directly to the router. I will use TZO service on both machines. I need and explanation on what port or ports to forward on the router that remote desktop will need opened to this ip of 192.168.1.50. Any additional input will be greatly appreciated.
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