I always found it disappointing that desktop environments usually only support a single mouse pointer and a single focused window / insertion point for keyboard input.
Unixy systems might support multihead where devices could be routed to separate desktops, but I'm thinking more like
If you had a very large 4k tv hooked up two a computer with two keyboards and two mice/trackpads, and did pair programming with a colleague or a child, able to edit separate windows/tabs or the same one simultaneously.
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