Int 21 Fn 5F03  - DOS 3.1+ Network - Redirect Device                       [D]

   AX = 5F03h
   BL = device type
       03h printer
       04h disk drive
   CX = user data to save
       0000h for LANtastic
       4E57h ("NW") for NetWare 4.0 requester
   DS:SI -> ASCIZ local device name (16 bytes max)
   ES:DI -> ASCIZ network name + ASCIZ password (128 bytes max total)

Return: CF clear if successful
   CF set on error
       AX = error code (01h,03h,05h,08h,0Fh,12h) (see AH=59h)

Notes: if device type is disk drive, DS:SI must point at either a null string
     or a string consisting the drive letter followed by a colon; if a
     null string, the network attempts to access the destination without
     redirecting a local drive
   the DOS kernel calls INT 2F/AX=111Eh with AX on top of the stack
   also supported by Banyan VINES, LANtastic, and 10NET

See Also: AX=5F02h,AX=5F04h,INT 2F/AX=111Eh