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Int 21 Fn 3700 - DOS 2+ - "switchar" - Get Switch Character [D]
AX = 3700h
Return: AL = status
00h successful
DL = current switch character
FFh unsupported subfunction
Desc: Determine the character which is used to introduce command switches.
This setting is ignored by DOS commands in version 4.0 and higher,
but is honored by many third-party programs.
Notes: documented in some OEM versions of some releases of DOS
supported by OS/2 compatibility box
always returns AL=00h/DL=2Fh for MS-DOS 5+ and DR-DOS 3.41+
See Also: AX=3701h
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