How does the VKontakte player work?

Question

Web development

So, for starters:
1. Go to your Vkontakte page
2. Open your player and play any song
Did you sing? Now, abruptly navigate to another page (be it "Messages", "Settings", whatever).
While navigating through the pages, playback was not interrupted. What is this technology?

Answer 1

Ajax :) the page is fully dynamic.

Answer 2

And the technology is called History API