INT 21 - Novell NetWare - MESSAGE SERVICES - LOG NETWORK MESSAGE
        AH = E3h subfn 0Dh
        DS:SI -> request buffer (see below)
        ES:DI -> reply buffer (see below)
Return: AL = status
            00h successful
Desc:   append a line to the default file server's NET$LOG.MSG file
Note:   this function is supported by NetWare 4.0+, Advanced NetWare 1.0+, and
          Alloy NTNX
SeeAlso: AH=E1h/SF=09h

Format of request buffer:
Offset  Size    Description
 00h    WORD    length of following data (max 52h)
 02h    BYTE    0Dh (subfunction "Log Network Message")
 03h    BYTE    length of message (01h-50h)
 04h  N BYTEs   message (no control characters or characters > 7Eh)

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