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where is num lock on a dell keyboard
Num Lock. Short for numeric lock or number lock, the Num key, Num Lock, or Num Lk key is located on the top left corner of a keyboard's numeric keypad.
Why was the num lock key created
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.
What is the num lock on a Dell Keyboard used for
Num Lock would be used to select between the two functions to convert part of the main keyboard to act as a, slightly skewed,  numeric keypad rather than letters.
How do I turn the num lock function on
To turn on the Num Lock function, press the Num Lock key until you see the LED above it turn on.

Question: Do Apple computers have the key
Self-contained rewrite: Do Apple computers have the key