The NtQuerySystemInformation is a useful undocumented and discouraged API of ntdll.dll. This API shouldn’t be used but in some cases is a short way to get a lot information.

Here is a link to msdn for the NtQuerySystemInformation API.
http://msdn.microsoft.com/en-us/library/ms724509%28VS.85%29.aspx

This example contains complete source code for full use of the ntquerysysteminformation api.


Only Delphi source code is included in the archive.