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  • Thank you! This is helpful—I'm still trying to grasp then, if only one program is accessing I/O devices at a given time, how it possible that I can open /dev/input/mice like this in my process and receive those mouse events in my process, yet also X server is receiving these very same events, presumably by also reading from the same /dev/input/mice? Commented Jun 5, 2020 at 4:43