WAN sockets programming

I'm working on a chat client similar to aim, and at the moment all testing has been on my local network with ip's in the range 192.168.1.xx. I'm interested in using this application over a wider area than just my LAN, and was hoping that someone could fill me in on what's necessary to make it so that if someone i'm running the application in server mode, someone i know could run it and supply my external ip (and port of course), in order to communicate with my computer. is anyone familiar with this sort of scenario?


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