I can't speak for Visual Basic, but in Delphi, you request a list of HID devices, and each one has it's own "Handle".

If two devices have the same Vendor/Product ID's then you look for the serial number to tell the difference. But access to the device is by specifying the Handle.

Here's a small program that can identify the serial number and handle. Note: the handle changes on every connection or power-up/re-boot.

www.pbpgroup.com/files/HIDmonitor.exe
Put it anywhere, there is no installation to do.
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