Dell Latitude C840 - Manual (Page 4)

The green lights located above the keyboard indicate the following:
Keyboard — The keyboard includes a numeric keypad as well as the Microsoft® Windows® logo key . For information on supported keyboard shortcuts,
see " Using the Keyboard and Touch Pad ."
Track Stick — Use the track stick and track stick buttons as you would use a mouse. See " Using the Keyboard and Touch Pad " for more information.
Touch Pad — Use the touch pad and touch pad buttons as you would use a mouse. See " Using the Keyboard and Touch Pad " for more information.
Battery Bay — When a battery is installed, you can use the computer without connecting it to an electrical outlet. See " Using a Battery ."
Display Latch Button — Press this button to release the display latch and open the display.
Module Bay — You can install devices such as a CD drive, CD-RW drive, DVD drive, Zip drive, second hard drive, second battery, or Dell TravelLite™ module in
the module bay. For more information, see " Using the Module Bay ."
Touch Pad/Track Stick Buttons — Correspond to the left and right buttons on a standard mouse.
If the computer stops responding, press and hold the power button until the computer turns off completely (which may take several seconds).
Dell AccessDirect™ Button
Keyboard Status Lights
Turns on when the numeric keypad is enabled.
Turns on when the uppercase letter function is enabled.
Turns on when the scroll lock function is enabled.