Since we can chat with netcat, why a chat feature was not implemented? AWESOME program! I want to port this to GTK+ or PyGTK. http://ihu.sourceforge.net/doc/manual.html#1.1.1 Tip: You can easily test if everything is fine using the netcat program: Receiver runs "nc -l -p 1793" (or for UDP "nc -u -l -p 1793"), and Caller runs "nc RECEIVER_IP_ADDRESS 1793" (or for UDP "nc -u RECEIVER_IP_ADDRESS 1793"). If you can see what your partner is typing (and viceversa), then IHU won't have any kind of problems.