posted on Oct, 11 2012 @ 10:26 AM
I'm sure there is someone here that can explain this a lot better than I, especially since I toyed with it a bit a few years ago, but it basically
maintains a connection to the web server after the page has loaded and updates certain areas or objects dynamically as they change.
Kinda like a quick refresh of a certain area within the page, without having to constantly reload the entire page.
Just like when you navigate, pan and zoom using Google maps.
The page URL stays put, but the main map window area is constantly getting refreshed behind the scenes.