Texas Instruments Extensa 600 Series - Manual (Page 75)

External Monitor
4-5
You can connect the computer to external
monitors, many of which can display resolutions
higher than 640 x 480.
When the computer is connected to an external
monitor, you can use the computer with the
display closed.
You can also display images on the external and
internal display at the same time. This feature
is called SimulSCAN™. To enable this feature,
set the DISPLAY parameter in Setup to Both.
Setup is accessed via the Setup hot key (Fn+F1).
There is also a hotkey (Fn+F12) that lets you
easily switch between LCD, CRT or Both
(SimulSCAN).