Texas Instruments 4000M - Manual (Page 169)

GETSTAT /V
If the computer is displaying data on both the external
monitor and the built-in LCD, GETSTAT exits with an
ERRORLEVEL=2.
If the computer is displaying data on an external monitor,
GETSTAT exits with an ERRORLEVEL = 1; if the computer is
using its built-in LCD , GETSTAT exits with an ERRORLEVEL = 0 .
Sample GETSTAT File
The following sample shows a typical GETSTAT file you could
create as a batch file named SAMPLE.BAT . This file is stored
in the /UTILS directory.
GETSTAT Utility
9-4 Other Utilities