A good day everyone !
I have a small question: who can explain for me what is called 'Native' ?
thanks !

Answers.com:
The Native API (with capitalized N) is the publicly mostly undocumented application programming interface used internally by the Windows NT family of operating systems produced by Microsoft. All of them is in ntdll.dll.

also look at http://www.sysinternals.com/Information/NativeApi.html

Thanks, read now !