Usability of XmlHttpRequest
Cont…
–2.  Do not break what the user is focusing on:
•Don't pull the user away from their current interaction just because AJAX has the capability
•Users will be confused if their focus is stolen before they are finished their task
•Consider usability first before technical capacity to make things quicker
•Sometimes a "go" button is still better than an automatic action and you can still do it in AJAX without page refreshes
•On to DHTML and JS accessibility …