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

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)

See also: 21E1

21E3 - Novell NetWare - MESSAGE SERVICES - LOG NETWORK MESSAGE