|USB : USB Classes A Closer Look at HID Class|
HID devices can be used for all sorts of applications, like these:
In fact, just about any kind of device that doesn't already fit into some other existing USB class, and in which a 64,000 byte per second data rate is acceptable, can usually be done better, faster, and more intelligently as a USB HID class device. And it will never require a special device driver to be installed, either.
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