Can someone explain how to do this? I am a novice regarding firewalls/routers and I need to open this port in order to allow a connections for a virtual classroom software that will be running on a Windows XP box in a Win2k3 Domain. Could someone give me kind of a step by step on how to open this port? Also, I need to know once the port is open how to direct it to the machine that the software is running on, as the internal network are private IP addresses (192.168.1.x). I am not sure how things work as far as the port being open on the router, how does the info go thru that port and to the correct machine behind it? (is that port mapping?)