Compatibility: 2.0 only
Purpose: An undocumented CONFIG.SYS command supported by DOS 2.x ONLY.
It was intended to let users choose a character other than
slash (/) as the character to begin DOS command-line options
(switches).

Some sort of perverse compatibility with UNIX (and its -opts
format) was no-doubt intended.  It was never really supported,
even by DOS commands (let alone third-party programs).

Syntax: SWITCHES=c

  Parameters  

c is the desired switch character; e.g., SWITCHAR=- sets the
character to a dash (-).

  TECH Notes  

  If you want your command-line parser to look for a character other
than /, be my guest; but it's of no interest to DOS or me.  See PSP.

  DOS fn 3700H (query switch character) is also obsolete, but remains
supported through DOS 6.0.  It always returns 2fH (/).

  DOS fn 3701H (set switch character) is obsolete and unsupported.
Calling it is a NOP; it does not return an error, but has no effect.

- -

SWITCHAR= (CONFIG.SYS Command)