Compaq Armada 7400 Reference Manual page 35

Press the
the right arrow key to increase light intensity; press the left arrow
key to decrease light intensity.
The embedded numeric keypad is a section of the computer
keyboard that converts to a numeric keypad when the number lock
function is enabled.
Press
Enable the embedded numeric keypad (Num Lk light on).
Disable the embedded numeric keypad (Num Lk light off).
With the number lock function enabled:
Press to type lowercase letters.
Press
hotkeys to adjust the display brightness. Press
to:
to type uppercase letters.