HP ProBook 455 G1 Notebook PC - Manual (Page 19)

Component Description
(1) esc key Displays system information when pressed in combination
with the fn key.
(2) fn key Executes frequently used system functions when pressed
in combination with a function key, the num lk key, or the
esc key.
(3) Windows button Returns you to the Start screen from an open app or the
Windows desktop.
NOTE: Pressing the Windows button again will return you
to the previous screen.
(4) Function keys Execute frequently used system functions when pressed in
combination with the fn key.
(5) num lk key Turns the embedded numeric keypad on and off when
pressed in combination with the fn key.
Alternates between the navigational and numeric functions
on the integrated numeric keypad.
(6) Integrated numeric keypad When num lk has been enabled, it can be used like an
external numeric keypad.
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