D.  Apps don't keep history or inform AT on UI updates
•Conventional post/response creates “history” and provides data to AT by it's nature.  What about AJAX?
•Browser history may not be meaningful in an AJAX app - so the means for users to go back/forth needs to be built into the app
•How can AJAX apps provide information to screen readers that the UI has changed without doing it in the UI where they won't "see" it?
•As well as XHTML/CSS techniques, consider:
–1.  XmlHttpRequest usability and accessibility
–2.  DHTML and JavaScript accessibility
–3.  Interaction model for AT and browser to provide meta-UI
•Let’s consider these in turn