Monitor RS232

Hi,

I have installed a VB application in my computer that communicates with an external device. However, I am not really sure how the communication protocol looks like. Therefore, I would like to write a VB software that monitors everything that is being exchanged between the external device and the other VB application. Any ideas how this can be done? has anybody done something like that before?

Please advice.
Thanks,
E.

You cant do this with VB.

The best you can do is have the device attached to a com port and use VB to interact with it using the Comm control, then monitor the information through the on_comm event