HP ENVY Rove 20-k121us Mobile All-in-One Desktop PC - Manual (Page 32)

Component Description
num lock key Controls the function of the integrated numeric keypad. Press the
key to alternate between the standard numeric function found on
an external keypad (this function is turned on at the factory) and
the navigational function (indicated by the directional arrows on
the keys).
NOTE: The keypad function that is active when the computer is
turned off is reinstated when the computer is turned back on.
Integrated numeric keypad Set at the factory to function like an external numeric keypad. To
alternate between this numeric function and the navigational
function (indicated by the directional arrows on the keys), press
the
num lock key.
24 Chapter 5 Navigating using the keyboard and pointing devices