Detect USB Device using Vendor and Product ID

Given a Vid and Pid (vendor and product ID) for a USB device, can someone describe (or link to an example) how to determine if that device is active on the system?   C#, VB or C++ are fine for an example.

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rmichelsAuthor Commented:

The solutions look promising but I've not had time to work through them to make sure they are what I want.  So I haven't forgotten about the question :)  Probably on Monday I can absorb the info and accept as solution

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