There are a few great tutorials on the NI web site. The first discusses genlocking multiple cameras together. It is in the context of the JAI CV-M1, but all the concepts can be applied to other camera types. It is called "Genlocking Multiple JAI CV-M1 Cameras" (http://zone.ni.com/devzone/conceptd.nsf/webmain/7A6B5853548850E886256C21005B1413?opendocument). Another turtorial I suggest looking at is "Advanced Analog Triggering and Synchronization Techniques" (http://zone.ni.com/devzone/conceptd.nsf/webmain/A387B5C0AC6F6F4E86256C87005FCDDF?opendocument). This tutorial has a section which discusses triggering and synchronizing with multiple cameras. The last tutorial I recommend is "Multi-Camera Acquisition"(http://zone.ni.com/devzone/conceptd.nsf/webmain/D91BAC1317F9D
0A686256C9300769A0D?opendocument) This discusses how to synchronize and program multi camera acquisitions on the 1409.
Hope this helps!