The timeline is a temporal segmentation: Each step in the segmentation
can alter the properties of the objects on the stage. Using scripts it is possible to jump to a specific step, to
stop the timeline execution, or to resume it. To give more tools to the developer, each stage can contain
any number of substages, known as movie clips, that can be further nested and each with its own timeline.
The movie clip expression is used generically in this chapter to indicate any object that has a visual
representation. In Flash 9 this is not strictly correct because some of the classes that are displayable are
not or do not extend the MovieClip class. Therefore, the expression is associated to some items in the
speech more for their behavior than for their technical implementations.
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The stage has a default irremovable root movie clip that contains every other movie clip in the scene.
Movie clips are stacked in piles based on a depth - level value; the ones with higher depths are on top; at
depth - level parity, the last movie clip defined goes on top.
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