To make your movies more interactive, Flash 5 included numerous built-in functions that automated the process of movie clips interacting with other objects. One such function is HitTest. HitTest enables you to ask Flash "Is this movie clip colliding or in contact with that movie clip?". If Flash could talk, it would say, "Yes, Masta Flash Programma, the movie clip is in contact with this movie clip!" or "No, the movie clip is not in contact......!".