> Right, so... if I'm understanding this right, XMLHttpRequest allows a mere 
> script to instruct the browser to send an HTTP request, and return the 
> body of the response as data, which the script can then further 
> manipulate?

What happens when the user presses the back button after such a process? 
Can the script intercept this and provide its own "back" functionality?

I've definitely got annoyed by some sites where you hit the back button and 
it takes you to a site you were looking at 10 minutes ago, because all the 
things you've been doing on this site haven't actually loaded a new page...

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