Hi etudiant2007 -
I noticed that this is the same topic as your posts
here,
here, and
here. We always recommend that users keep topics to a single thread. This makes our forums easier to use by keeping all the information on that topic in the same place. As such, NI responses will be contained to one of your four threads. If you receive helpful replies in any of the others, please share that information in the main thread.
David Staab, CLA
Staff Systems Engineer
National Instruments