|USB : Overview USB Facts of Life|
A USB Interface is one independent entity in a USB peripheral device that can send or receive, like what you would usually think of as being one device.
In Microsoft Windows software, an Interface is what your user-mode program can tell Windows to “open,” and with which your program can communicate.
Just like you can open multiple files at once, and read and write data to each one separately, Windows can open multiple Interfaces at one time, and communicate with each Interface separately.
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