INT 21 - Novell NetWare - MESSAGE SERVICES - GET BROADCAST MESSAGE
        AH = E1h subfn 01h
        DS:SI -> request buffer (see below)
        ES:DI -> reply buffer (see below)
Return: AL = status
            00h successful
            FCh full message queue
            FEh out of dynamic workspace
Note:   this function is supported by NetWare 4.0+ and Advanced NetWare 1.0+
SeeAlso: AH=DEh/DL=04h,AH=E1h/SF=00h,AH=E1h/SF=05h,AH=E1h/SF=09h

Format of request buffer:
Offset  Size    Description
 00h    WORD    0001h (length of following data)
 02h    BYTE    01h (subfunction "Get Broadcast Message")

Format of reply buffer:
Offset  Size    Description
 00h    WORD    (call) size of following results buffer (max 38h)
 02h    BYTE    length of message (00h-37h)
                00h if no broadcast messages pending
 03h  N BYTEs   message (no control characters or characters > 7Eh)

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