Alexandre,
I suggest you have a look a these links:
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/0afbc7d8d4d669788625634f00702b0f?OpenDocument
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/f2994d9685ef75bf862561820002dbad?OpenDocument
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/cff24c97da1fc665862560fd006a21d2?OpenDocument
http://zone.ni.com/devzone/explprog.nsf/6c163603265406328625682a006ed37d/f62401b4cb14ac138625683c006f464e?OpenDocument
Regards,
Cyril Bouton
Applications Engineer
National Instruments
Cyril Bouton
Active LabVIEW Developper