what is AJAX engine?

Sorry if i'm rude. But i must repeat what was said in this forum hundreds of time: SEARCH (http://www.google.com/search?hl=en&q=AJAX+engine&btnG=Google+Search).

If that doesn't helps you, it means you should refine your question.
If that helped you, it means you wasted my time and the time of all who are reading this. My gf is calling me to sleep and you made me lost 3 minutes away from her. =(