USB : USB Classes    Software for HID devices  

A few devices, like mice and keyboards, are intended to be read directly by the operating system.  These few special devices cannot in fact be opened for direct I/O by a user mode Windows program.

Most other devices need some kind of a program to talk to control them, send commands to them, and receive and display data from them. Most users expect a real Windows GUI program with products that they buy.


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