Int 21 Fn 3701  - Dos 2+ - "switchar" - Set Switch Character               [D]

   AX = 3701h
   DL = new switch character

Return: AL = status
       00h successful
       FFh unsupported subfunction

Notes: documented in some OEM versions of some releases of DOS; DOS 2.x had
     a SWITCHAR=c setting in CONFIG.SYS
   supported by OS/2 compatibility box and Novell DOS 7
   ignored by MS-DOS 5+ and DR DOS 3.41-6.0; DR DOS 6.0 and Novell DOS 7
     leave AX unchanged

See Also: AX=3700h