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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.

Question: How do I turn the function on
Self-contained rewrite: How do I turn the num lock function on