HP EliteBook 840 G3 - Manual (Page 38)

Using the embedded numeric keypad (select models only)
Component Description
(2) fn key Turns the embedded numeric keypad on and off when pressed in
combination with the num lk key.
NOTE: The embedded numeric keypad will not function while an
external keyboard or numeric keypad is connected to the computer.
(5) Embedded numeric keypad When the keypad is turned on, it can be used like an external numeric
keypad.
Each key on the keypad performs the function indicated by the icon in
the upper-right corner of the key.
(7) num lk key Turns the embedded numeric keypad on and off when pressed in
combination with the fn key.
NOTE: The keypad function that is active when the computer is
turned off is reinstated when the computer is turned back on.
28 Chapter 4 Navigating using the keyboard, touch gestures and pointing devices