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


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