Despite plenty of improvements of search engines and especially Google, flash still causes big problems.
It is necessary to offer an HTML alternative to flash. This alternative consulted by Internet users who do not have Flash, and therefore search engines, must be as close as possible to the Flash version (excluding animation of course) in terms of content.
The HTML markup used must be consistent with what the flash displays.
As with any web page, it is necessary to propose a different URL for each page with a customized content (title, description, text…).
It is recommended to use swfadresse libraries and swfobject.