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I need to listen to everything that goes (both directions) through a virtual serial port on Windows 7 64bit.

I do not need to send anything, just monitor the communication for debugging purposes.

How can I do that?

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You can use Process Monitor from Sysinternals

It allows to see all reads and writes made by a process.

enter image description here

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It doesn't work for 64bit OSs. – jlafay Dec 20 '11 at 15:07

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