ParamPlot

Play

The most important button. The curve is displayed when hit.

Frame Advance

The Frame Advance advances the curve frame by frame. The Frame Advance button will not work if there is that phrase "No more frames."

Direction

The Direction button allows the image to be drawn either in a forward direction or in a reverse direction.

Playback Mode

The Playback Mode allows single play if the icon is a straight arrow. If the icon is shaped like a loop, the Playback Mode allows continuous play.