See: Fn 3700H (query switch character) Fn 3701H (set switch character) These two functions are ◄Undocumented► and ◄Obsolete►. They were intended as part of a system that would enable DOS users to select a character other than slash (/) as the lead character for command options. See the obsolete SWITCHAR= CONFIG.SYS command. See Also: Handle-Oriented File I/O DOS Functions -♦-