Luiart,
If you go to ni.com and make a search for "RTSI" or "Routing", you will find a lot of information regarding synchronization.
Here are a couple of places that I found interesting.
Information:
http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/ced34fe76e435edb8625686b006d9b56?OpenDocument
Examples:
http://zone.ni.com/devzone/explprog.nsf/6c163603265406328625682a006ed37d/49e723dfae06f04686256aea006eeafb?OpenDocument
http://zone.ni.com/devzone/explprog.nsf/6c163603265406328625682a006ed37d/8ece6e004d24f5c4862566880052a787?OpenDocument
Good luck with your application.