Hi, I found a useful USB HID page:
http://labs.mike-obrien.net/Document.aspx?id=hidlibrary
I downloaded his HID library and knocked together a quick VB.NET program to talk to an 18F4550. It works very well indeed. If anyone would like to see the program that I used, feel free to drop me a line.
Very best regards.
Useful USB HID stuff
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