Flash actionscript "collections"

Is there a way of accessing all movie clips in a movie. I want to do something similar to collections in javascript. Basically, I want to be able to add a movie clip sprite e.g. a pacman to any movie and have it move around and know when it collides with any other movie clip (it's not being dragged)

so something like:?

for (Loop = 0; Loop<AllMovieClips.length; Loop++) {
     trace(AllMovieClips[Loop]._target);
}

I want to know if there is something in actionscript equivalent to AllMovieClips i.e. a collection of all the movie clip objects in a movie that i can access by an identifier number.

Thanks