Dell Latitude C610 - Manual (Page 34)

To temporarily disable the keypad so that you can use other functions of a dual-function key, press
and the desired key, or press and the desired uppercase letter or shift
function of the key.
Keyboard Shortcuts
System Functions
Restarts (reboots) the computer
Enables and disables the numeric keypad
Enables and disables scroll lock
Display Functions
Switches the video image to the next display in the following sequence: the integrated display,
an external monitor, and both displays simultaneously
Increases brightness on the integrated display only (not on an external monitor)
Decreases brightness on the integrated display only (not on an external monitor)
Power Management