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SEO for flash is very complex, mostly based on tips and tricks. The easiest way to go is external links with anchors +the basics html optimisation. If you are serious about it, Adobe has partnered with the search engines to make flash content discoverable (Ichabod), some peoples (Damien Bianchi) suggest developers to create XML and video sitemaps along with an HTML sitemap for websites, reading this article may help you : http://www.adobe.com/devnet/seo/articles/checklist_ria.html , I hope this helps.