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NMAP (*nix and windows versions available) will tell you which ports are open on a specific machine.
In windows, "netstat" can also give you good information.
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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