Screenshot. Here, I'm forwarding port 3389 (default port for remote desktop) to 192.168.250.100, and 5190 (default port for PCAnywhere) to 192.168.250.97. Make sure the computer you're using has a static address on your LAN. Then, what you'll do is find out what your WAN IP address is (www.whatismyip.com), and tell your friends to connect to your WAN IP on TCP/IP port: 8765 and UDP Port: 8766 (you'll want to setup port forwarding for TCP and UDP).
http://forum.teamspeak.com/showthread.php?t=35