Show selected area: show additional (video) areas for debugging purposes.
CAUTION: Although it is possible to insert an image and used that to calibrate the video, in my experience, the image (jpeg or whatever) has often a different size than the video (which makes calibrating the video more difficult). You can check this by comparing the two sizes as displayed on the top panel. This is why I always try to calibrate from the video itself if possible.
PRINT: It is possible to print the windows and the graphs in several Windows. The size and orientation can be modified in the shift-P option. I usually choose landscape orientation and reduce the size to 80% but this will depend on your own printer and its configuration.
Window #1: TRACKING WINDOW. This is the heart of the program. This is where you decide what part of the screen you want to track the recorded movements or displacement in time. The screen is filled with several panels to provide you with information and choices that have to be made before starting the tracking.