The figure shows the controls of the animator with explanations.
In Kocbach's version the animator starts with the 'loop state' and running.
In the original version by Holecko, used by some of our older versions, the standard is 'play once' and starting in 'PAUSE' position. So one must click on Forward to start in Holecko's version.
You can vary the speed, step by one frame, jump to the start or to the end.
Ladislav Kocbach, The present modification, and for the Atomic movies the original animator for X-windows, Mac and DOS (Bergen)