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Probe Me!
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Good news! I've found a simpler way (sort of) to accomplish this. Just open a DOS prompt and type
netstat -a
It will show you every connection on your machine as well as where you are connected to. Or you're welcome continue reading about the "ProbeMe" program I wrote before  I found out about netstat.

This is a Winsock "port probe" program with a slight twist. Unlike most other port probes, it doesn't check someone else's computer, and it doesn't try to connect to a socket. It works by actually trying to open each port on your computer as a server socket to see if it can be done. If the socket can't be opened, that means some other program is using it. On my 133 Mhz machine, all 65535 ports can be scanned in about 7 minutes.

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