Capture traffic on a "Microsoft loopback interface"

[evald ibrahimi <evald80 () hotmail com>]

Hello everybody,

I need to capture the traffic between an application and a loopback interface. Both application and loopback interface 
are installed on the same machine(windows xp). It is the application itself that during its installation has created 
the "microsoft loopback".
This is an application that controls an hardware. The last is connected with a serial port(RS-232).
I believe that the software sends the command to loopback and the loopback send tham through the rs232.

Basically, i need to see what commands are sent to the hardware. Any idea?

thank you.
                                          
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