When you provide audio narrations or video that contains speech, provide captions for those users who cannot hear. You can use text fields in Flash, import video that contains captions, or even use an XML caption file. You can use video cue points to specify when a text field should update text information at runtime.
For information on using Hi-Caption SE and the Hi-Caption Viewer component, see www.adobe.com/go/flash_extensions. This third-party extension lets you create captions that you save in an XML file and load into the SWF file at runtime, among other advanced controls. Alternatively, you can use cue points and a text field to display caption information.