I remember that back around 2003 I was making a highly interactive site that used iframes in a similar way - the parent page set the URL, the child one called w

I remember that back around 2003 I was making a highly interactive site that used iframes in a similar way - the parent page set the URL, the child one called window.parent.something() to pass data back. I actually had no idea that I was on the cutting edge in this one-page app world at the time, I was just noodling around at university. But it was a lot of fun.