I have some questions:
2) Is the AJAX engine downloaded from the server to the client (Browser)?
I mean, is the following process correct?
--At first the client/browser does not contain the AJAX engine;
--Then the browser makes a request to the server;
--The server send back the AJAX engine or the AJAX engine is download to the client;
--The client then can make the AJAX call
3) If the 2) is correct, then how is the AJAX engine downloaded?
What could be the statement(s) that can trigger the downloading of the AJAX engine?