Ah yes sorry, forget that!
I'm using Windows System (Windows 2000 Server, Windows XP and Windows 2003 and later also Windows Vista Server)
currently I'm starting it like this:
system("test.bat");
and in test.bat I have a test inside that runs ntbackup and makes a backup of some folders. (just for testing).
Since the ntbackup needs 30mins.
But later on I want to be able to start any application without having to wait the result of it!