Num Lock would be used to select between the two functions. Most earlier computer keyboards had different number keys and cursor control keys however, to reduce cost, IBM chose to combine the two in their early PC keyboards. The Num Lock key exists because earlier 84-key IBM PC keyboards did not have cursor control or arrows separate from the numeric keypad. Its state (on or off) affects the function of the numeric keypad commonly located to the right of the main keyboard and is commonly displayed by an LED built into the keyboard. It is a lock key, like Caps Lock and Scroll Lock.
Num Lock or Numeric Lock ( ⇭) is a key on the numeric keypad of most computer keyboards. A keyboard with Num Lock turned on as indicated by an LED
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