Seeking an application that will passively monitor or spy on traffic over a serial COM port. Requirements are:
•Windows 7 64 bit compatible
•Free, and not crippled until paid for
•Able to monitor a COM port without the use of hardware
•Able to monitor a COM port that is already in use between another application and a connected device i.e. passively able to monitor in both directions without interrupting the COM port's functionality.

I've tried a LOT and most won't work on Win 7, others are crippleware, others are intrusive and not passive at all. Would appreciate any suggestions, thanks in advance