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