Using ActionScript in Flash.pdf
Macromedia Flash MX 2004 and Macromedia Flash MX Professional 2004 are the professional standard authoring tools for producing high-impact web experiences. ActionScript is the language you use to add interactivity to a Flash applications, whether your applications are simple animated movies or more complex rich Internet applications. You don’t have to use ActionScript to use Flash, but if you want to provide basic or complex user interactivity, work with objects other than those built into Flash (such as buttons and movie clips), or otherwise turn a SWF file into a more robust user experience, you’ll probably want to use ActionScript
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Macromedia Flash MX 2004 - Using ActionScript in Flash.pdf