In short, it makes the keys on a numerical keypad allow you to control the mouse (move up/down/left/right and click)
[1] https://etc.usf.edu/techease/4all/input-devices/what-are-mou...
In short, it makes the keys on a numerical keypad allow you to control the mouse (move up/down/left/right and click)
[1] https://etc.usf.edu/techease/4all/input-devices/what-are-mou...