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How can I tell what application is listening to a port?

Is there a way to determine what application is listening to a port? Netstat reports the port as already bound. Telnet-ing to the port directly doesn't reveal much. Is there some way to query the OS to reveal what application has bound to the port?
I answered almost the same question for another member not too long ago. Please see When I execute Netstat, I see over 20 unidentifiable ports connected or listening for your answer.

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