INT 21 - DOS 3.1+ network, Banyan VINES, LANtastic - CANCEL REDIRECTION
        AX = 5F04h
        DS:SI -> ASCIZ device name or path
Return: CF clear if successful
        CF set on error
            AX = error code (01h,03h,05h,08h,0Fh,12h) (see AH=59h)
Notes:  the DS:SI string must be either a local device name, a drive letter
          followed by a colon, or a network directory beginning with two
          backslashes
        calls INT 2F/AX=111Eh with AX on top of the stack
SeeAlso: INT 2F/AX=111Eh