They do not all use the same port. I cannot test this because I don't use AIM or MSN messenger and don't want to download either but...Try doing a netstat -a on your dos prompt (command.com or cmd.exe) when you have the program running.
The netstat idea is good, now I just need a willing volunteer with AIM. I refuse to put that on my machine! Does anyone have AIM and would be willing to try that test?
Infinite,
Thanks for the help. Those sites were exactly what I wanted.
I don't measure a man's success by how high he climbs but how high he bounces when he hits bottom. --General George S. Patton