So I was sitting in class and this guy pulls out his laptop.  It's closed, but I guess it's on, because he proceeds to pull out a stylus-pen and take notes throughout the class as if the laptop was a piece of paper.  It was so cool!  It looked like a regular lap-top when it was open - keyboard, screen, etc - but when it was closed I guess there was a second screen that he was writing on?

Does anyone know what I'm talking about?  I want one!!
Who makes laptops like that?  What terminology do I need to know if I want to go buy one?