HELLO EVRYBODY
as the title says
just see the code first, it's very simple, using the shell of shutdown command,,,,
HAMMAM ABUARQOUB FROM PALESTINE

Another method can be found here:

http://www.mvps.org/access/api/api0016.htm

this example in case you didn't even open and saw uses one simple line of code for each case of shutdown, restart or logoff rather than a coplete API function,,
thanks for notes