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“It's called a mouse mover and it moves your mouse while you're away so you can go to the bathroom free from paranoia,” she explains. Mouse movers are small devices that go under a computer's mouse (not a laptop trackpad) and keep the cursor active without any human interaction.

Ennio Morricone / Katica Illényi - Once Upon a Time in the West - Theremin
https://www.youtube.com/watch?v=lY7sXKGZl2w