I saw that JQuery has a function "Jquery.get()", which can refer to divs in other pages via the "#" sign. I tried adding that in my AJAX (non JQuery) code, but it doesn't make any difference.
So I was wondering, how does JQuery do it?
I looked through the source codes and couldn't find anything.

Also, while on the subject of AJAX, I was trying to think of a way to make a small chat app, that updates itself without having a timer running, whenever someone writes a new message. Is that possible?
(I'm assuming that would require the server to connect to all the users, but I'm not sure if that's possible when the page is loaded.