Motorola HK1223 Owner's Manual page 51

Key
Switches the display output to one of the following when an
external device is connected.
Upon booting the system with CRT:
Upon booting the system with DVI:
NOTES:
Serves as the sleep button that you can define with Windows'
Power Management. (See the "Power Management" in
Chapter 3.)
Switches the LCD backlight on and off.
Switches the optional GPS function on and off.
2-8
Description
LCD
CRT
LCD
DVI
When in full screen DOS mode, or when playing DVD or
MPEG file, display switching is not allowed.
If the display mode is set to 256 colors or lower, or in DOS
mode, there will be only two modes for selecting: CRT only
and LCD & CRT.
This function only applies to Plug & Play CRT monitors.
LCD & CRT
LCD & DVI
Operating Your Computer