HP ProBook 440 G2 Notebook PC - Manual (Page 31)

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 key Returns you to the Start screen from an open app or the
Windows desktop.
NOTE: Pressing the Windows key 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 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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