HP ProBook 640 G1 Maintenance And Service Manual page 24

Component
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14 Chapter 2 External component identification
esc key
fn key
Windows button
Function keys
num lk key
Integrated numeric keypad
Description
Displays system information when pressed in combination with
the fn key.
Executes frequently used system functions when pressed in
combination with a function key, the
the b key.
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.
Execute frequently used system functions when pressed in
combination with the fn key.
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.
num lk key, the esc key, or