HP ZBook 17 Service Manual page 25

Component
(5) num lk
(6) Integrated numeric keypad
key
Description
Windows 8:
Turns the embedded numeric keypad on and off when
pressed in combination with the
the navigational and numeric functions on the integrated
numeric keypad.
Windows 7 and Linux:
Alternates between the navigational and numeric functions
on the integrated numeric keypad.
When num lk has been enabled, it can be used like an
external numeric keypad.
fn key. Alternates between
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