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KBFLAG.DOC
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1986-11-28
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39 lines
KBFLAG -- by Nico Mark -- from PC Magazine, December 23, 1986
KBFLAG can be used to cause branching in batch files, so that execution of
different parts of the file can be dependent on the state of toggle and shift
keys. You can, for example, abort execution of AUTOEXEC.BAT if the CapsLock
key has been toggled while CONFIG.SYS in running.
KBFLAG tests for a keystroke in the buffer, and sets errorlevel to the value of
the key's KBFLAG in the ROM BIOS. Thus, if the Ins key has been toggled, it
will return an errorlevel of 128. Other values are:
1 = Right Shift
2 = Left Shift
4 = Ctrl key
8 = Alt key
16 = ScrollLock
32 = NumLock
64 = CapsLock
128 = Ins
(You can use sums of these values to correspond to combinations of keys, so
96 = CapsLock and NumLock together.)
If you put these lines at the start of autoexec.bat--
KBFLAG
IF ERRORLEVEL 64 GOTO :END
--and put the label :END at the end of the file, autoexec.bat will then check
to see if CapsLock has been pressed, and will jump the end of the batch if it
has. To prevent autoexec.bat from executing on bootup, simply hit CapsLock
while config.sys is running.
You can use variations of this technique to cause different sets of programs
to run during autoexec.bat (or any batch file). For example, Caps Lock could
cause only a few programs to run; Alt + CapsLock could cause others; etc.