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Function 5F03h (95-3)    Redirect Device                            . DOS 3.1

    Redirects I/O from a local printer or disk drive to a device on the
    network.

       On entry:      AH         5Fh
                      AL         03h
                      BL         Device type (3=printer, 4=disk drive)
                      CX         Saved parameter (all values but 0 are
                                 reserved)
                      DS:SI      Pointer to an ASCIIZ string containing local
                                 device name
                      ES:DI      Pointer to an ASCIIZ string containing
                                 network path followed by an ASCIIZ string
                                 containing a password

       Returns:       AX         Error code, if CF is set

       Error codes:   1          Network not loaded
                      3          Path not found
                      5          Access denied
                      8          Insufficient memory

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    This function allows you to redirect I/O from a local printer or disk
    drive to a network device.  You can also control access to the network
    device by means of a password.

       Notes:         Call this function with a device type code in BL (3
                      for a printer or 4 for a disk drive), and a 0 in CX.
                      DS:SI should point to the name of the device you
                      wish to redirect, and ES:DI should point to an
                      ASCIIZ string giving the name of the destination
                      network. The network name must be followed by a
                      second ASCIIZ string specifying a password. The
                      password may be 0 to 8 characters in length; to
                      specify no password, provide a null ASCIIZ string (a
                      0 byte).

                      If the redirected device is a printer, acceptable
                      names are PRN, LPT1, LPT2, and LPT3. If the
                      redirected device is a disk drive, the source ASCIIZ
                      string should consist of a drive letter followed by
                      a colon.

                      The source ASCIIZ string may also be null; in this
                      case, DOS attempts to provide access to the network
                      name with the specified password.