e desktop into a 3D world per se, we are trying to enhance the view of a 2D world by adding 3D functionality where it makes sense. For a user of a traditional 2D environment, at first blush this will simply look like a much, much nicer extension of their existing environment. For example, a 3D application might leverage the "back" of a window, allowing a user to flip a window over to take notes. As a more complex example, consider a modal dialog. As an example, our prototype window manager flips a window ov