I have a simple video website for my kids and each kid has a separate login. This is so they can each have their own videos, but also so that some videos can be private (ie. hidden from the outside world, or other logged in users). Typing in a username and password is impossible for my kids to do, as they are almost 5 and 2 years old, and they use this website on Google TV. So, with a magic token-style login, all they need to do is navigate to their bookmark on the Google TV homepage and press OK on the remote control.