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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.

Question: Used for what
Self-contained rewrite: What is the num lock on a Dell Keyboard used for