AnimatorDV Film Producer has an unique feature - you can connect up to 8 sources, e.g. 4 still cameras and 4 DV camcorders as a reference for them. You can also use webcams, which look into viewfinder in camera.
Other combination are allowed, of course.
Only 2 digital cameras, only 3 DV camcorders or 4, etc.

If to the AnimatorDV Film Producer is connected more than one source (video or still camera), split view allows to show grabbed sources in one window. It is usable for colors and frame comparison.
You can even play animation in the split view.

If you would like to check out the split view, you can use CEmulator tool. It simulates up to 4 digital still cameras.