Plug-ins
Plug-ins are like applets in that they are software applications that run within the browser. Plug-ins can render materials such as video clips, 3-D animations, and audio files within the browser. Sometimes, however, the plug-in acts as a stand-alone application, opening a new window where new content is displayed. If a new window is opened, you must remember to inform the user that a new window will open to play the media content, just as you would with new windows opened for any other reason.
Links
Creating Accessible Flash
(http://www.webaim.org/techniques/flash)
Macromedia's
Accessibility and Flash
(http://www.macromedia.com/macromedia/accessibility/features/flash)
