movieRate, movieTime, startTime,
stopTime and volume sprite properties.
The movieRate allows you to start and stop playback, as well as
adjusting its speed (eg, to simulate rewind and fast-forward operations).
The movieTime allows you to detect where you are in a movie, and jump to a
different frame. You may also want to use the duration of cast property to
compare the current movieTime with the length of the movie as a whole.
The startTime and stopTime properties allow you to
specify a segment of the movie to be played back.
The volume property allows you to change the volume of a
movie's soundtrack.
For examples of some of these properties in use, see the next two questions.