Function 5E03h          Get Printer Setup                            DOS 3.1+

    Retrieves the string of control characters added to the beginning
    of each file sent to a network printer.

        Entry   AX    = 5E03h
                BX    = Assign-list index
                ES:DI = Pointer to 64-byte memory buffer

        Return  CX = Length of setup string
                Setup string copied to buffer
                or
                AX = Error code, if CF is set
                     | 01h Invalid function (Network not running)