Compaq 1600 Series - Manual (Page 26)

3-4 Mobile Internet PC Features
Using the Numeric Keypad
To use the embedded numeric keypad, press Fn+NumLk. This key combination
switches the keys to numbers until you press Fn+NumLk again. When NumLock is
activated, the NumLock
h
light is turned on.
+
NOTE: If an external keyboard or numeric keypad is connected, pressing Fn+NumLk
on the notebook keyboard will not activate NumLock. You must press the NumLock
key on the external keyboard or numeric keypad to activate NumLock.
Numeric Keypad