INT 21 - Novell NetWare - FILE SERVER - GET FILE SERVER LOGIN STATUS
        AH = E3h subfn CDh
        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=CBh,AH=E3h/SF=CCh

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

Format of reply buffer:
Offset  Size    Description
 00h    WORD    (call) 0001h (size of following results buffer)
 02h    BYTE    login state (00h disabled, 01h enabled)