Sorry, this has nothing to do with C++, and everything
to do with Windows NT. Try posting in a Microsoft
These links tell you what's on topic in this group:
Welcome to comp.lang.c++
The comp.lang.c FAQ
The comp.lang.c++ FAQ Lite
Alternate C FAQ - gives some tips for platform-
and one from my web site: 'How to get help via usenet news'
For Microsoft Windows, try:
>I'm having a system, where people need to logon before they can use
>only people who are registered in the NT User manager database are allowed
>to access the system.