When a JAWS user "clicks" on a link in an HTML page, JAWS gives auditory notifications that a new page is loading, and starts reading the page once it is complete. In flash however, JAWS only sees what you go out of your way to wave in front of its face. If a JAWS user clicks on a button in a flash movie that changes all content on screen, all JAWS (and more importantly, your viewer) knows is that they clicked a button. There will be nothing to tell them that clicking that button had any effect.
To give notifications to JAWS users, I've been toying with the following method:
1.add a movieClip to the stage,
2.assign it an AccessibilityProperties with "name" set to the message I want the user to hear
3. set stage.focus to the movieClip I created. More