INT 21 - Novell NetWare - MESSAGE SERVICES - GET PERSONAL MESSAGE
        AH = E1h subfn 05h
        DS:SI -> request buffer (see below)
        ES:DI -> reply buffer (see below)
Return: AL = status
            00h successful
            FEh out of dynamic workspace
Desc:   return the oldest message in the default file server's message queue
          for the calling workstation
Note:   this function is supported by NetWare 4.0+ and Advanced NetWare 1.0+
SeeAlso: AH=E1h/SF=04h,AH=E1h/SF=06h,AH=E1h/SF=08h

Format of request buffer:
Offset  Size    Description
 00h    WORD    0001h (length of following data)
 02h    BYTE    05h (subfunction "Get Personal Message")

Format of reply buffer:
Offset  Size    Description
 00h    WORD    (call) size of following results buffer (max 80h)
 02h    BYTE    connection number of sending station
 03h    BYTE    length of message (00h-7Eh)
                00h if no personal messages pending
 04h  N BYTEs   message (no control characters or characters > 7Eh)