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

          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


        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  ■ DOS fn 3701H (set switch character) is obsolete and unsupported.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.

See Also: CONFIG.SYS Commands
          DOS Versions