INT 21 - Novell NetWare - PRINT SERVICES - GET DEFAULT LOCAL PRINTER
AX = B804h
Return: DH = default LPT port (00h-02h)
Note:   this function is supported by Advanced NetWare 2.1+
SeeAlso: AX=B805h,AH=DFh/DL=00h

See also: 21B800

21B804 - Novell NetWare - PRINT SERVICES - GET DEFAULT LOCAL PRINTER