Microsoft Windows accessibility feature that allows a user to control their mouse movement using the numeric pad on their keyboard. The Mouse Keys feature can be enabled and disabled through the Accessibility Options or Ease of Access Center in the Windows Control Panel.
How to enable and disable Mouse Keys
Mouse Keys can also be toggled on and off by simultaneously pressing the Left Alt+Left Shift+Numlock keys. If done properly, you should see a dialog box similar to the example shown below.
If you have no mouse, you can use the spacebar to say Yes to enable Mouse Keys.