I mean..see all the time u r on Gmail u just mail.google.com/mail on ur address bar....It just loads into the same web page.... How is that done...??
gmail uses AJAX. It's the new buzz term.
AJAX is an architecture and not a technology. AJAX stands for Asynchronous JavaScript And XML.
Instead of doing a normal POST/GET to the Webserver, AJAX uses an JavaScript Object called XMLHttpRequest. The Javascript will call this object and XMLHttpRequest will inturn do the POST/GET to the WebServer. This way we do not need to refresh the entire page just to update on a part of the web page.