INT 21 - Novell NetWare - FILE SERVER - DISABLE FILE SERVER LOGIN
        AH = E3h subfn CBh
        DS:SI -> request buffer (see below)
        ES:DI -> reply buffer (see below)
Return: AL = status
            00h successful
            C6h no console rights
Notes:  this function is supported by Advanced NetWare 2.1+
        the calling workstation must have console operator privileges
SeeAlso: AH=E3h/SF=CCh,AH=E3h/SF=D3h

Format of request buffer:
Offset  Size    Description
 00h    WORD    0001h (length of following data)
 02h    BYTE    CBh (subfunction "Disable File Server Login")

Format of reply buffer:
Offset  Size    Description
 00h    WORD    (call) 0000h (no results returned)