Switches the display output to one of the following three when
an external CRT monitor is connected through the docking
Display on both
NOTE: 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 Display on both.
Serves as the sleep button that you can define with Windows'
Power Management. (See "Power Management" in chapter
Operating Your Computer