Compatibility: 2.0+  Undoc 
Expects: AX    3700H
Returns: DL    current DOS switch character (always 2fH in DOS 5.0+)
Info: Obtains the character that DOS and applications may interpret as
the lead character in command-line switches.

This concept never really caught on; most programs do not bother
to check this value.  Nowadays, all programs just assume that
slash (/), ASCII 2fH, is the switch character.

Versions: 2.0+  This is an undocumented, though valid function.
5.0+  The corresponding function, 3701H, is now  Obsolete  (so
now there is no DOS-blessed way to set a non-standard switch

See Also: Fn 3701H (set switchar; obsolete)
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DOS Fn 3700H: Query Switchar