Its On A Keyboard N. Small Bumps On Certain Keycaps To Keep Touch-typists Registered.

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tits on a keyboard n.

Small bumps on certain keycaps to
keep touch-typists registered. Usually on the 5 of a numeric
keypad, and on the F and J of a QWERTY keyboard;
but older Macs, perverse as usual, had them on the D and
K keys (this changed in 1999).

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