Each window you call up on the screen can be either be viewed independent of all others or locked together for simultaneous viewing. For example, cue up six attempts of the same long jumper of different jumpers - position each video independently at the point of take off, then lock them together so that when viewed, each of the six windows moves together at the same time.  Easily point out the different between attempts or athletes and point out why one jump was better or why one athlete excels over the others. This feature harnesses the power of video!