INT 21 - Novell NetWare - MESSAGE SERVICES - GET BROADCAST MODE
AH = DEh
DL = 04h
Return: AL = current broadcast mode
00h receive server and workstation broadcasts (default)
01h receive server broadcasts, discard user message
02h store server broadcasts for retrieval
03h store all broadcasts for retrieval
Note:   this function is supported by NetWare 4.0+ and Advanced NetWare 1.0+


21DE - Novell NetWare - MESSAGE SERVICES - GET BROADCAST MODE