Compatibility:  Undoc   Obs  2.0-4.x
Expects: AX    3701H
DL    desired DOS switch character
Returns: none
Info: This  Obsolete  function previously set a global "switch
character" and was even supported by the undocumented CONFIG.SYS
command SWITCHAR=.

The idea was to provide a way to use a character other than slash
(/) as the lead-character in command-line switches (perhaps
freeing / for use in pathnames or allowing the UNIX-like dash (-)
as the switch character.

The concept never really caught on; most programs do not bother
to use Fn 3700H to check for changes.

Versions: 2.0-4.x  This is an undocumented, though valid function.
5.0+     This function is  Obsolete  and no longer supported
by DOS.  It does not return an error, but is ignored.

See Also: Fn 3700H (query switchar)
- -

DOS Fn 3701H: Set Switchar