Web design: "scroll-down navigation"

Question

What is the technique called that is used in some web apps, like http://www.alfredapp.com where the navigation scrolls down the site to reveal another site?

Answer 1

To get such way of navigation, i would put all of my content on a single page and use a "smooth scroll effect", like the one on this site, to switch between sections.

You will find plenty of more JavaScript (and jQuery) based "smooth scroll effects" by simply googling "smoth scroll through page sections".

That's how they probably done it on alfredapp.com too.