The methods for the MovieClip object provide the same functionality as actions that target movie clips. There are also additional methods that do not have equivalent actions in the Actions toolbox in the Actions panel.
You do not need to use a constructor method to call the methods of the MovieClip object; instead, you reference movie clip instances by name, using the following syntax:
Invoked continually at the frame rate of the movie. The actions associated with the enterFrame clip event are processed before any frame actions that are attached to the affected frames.
Invokes in the first frame after the movie clip is removed from the Timeline. The actions associated with the Unload movie clip event are processed before any actions are attached to the affected frame.