Flash Tip: Action Scripting Basics: Inserting a Simple Stop
From Adrien-Luc Sanders, former About.com Guide
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The Purpose of a Stop Command
The stop command is most likely the most basic of all action script commands, and the most essential. A stop is basically an instruction in the ActionScript program language that tells your Flash movie to pause on a particular frame, rather than continuing to the end of the animation or cycling endlessly. Stop commands are particularly useful if you're playing an animation before pausing to wait for a user response; you would insert a stop command at the end of the animation, once the options for the user are displayed. This prevents the animation from skipping past the options without giving the user a chance to choose one.