A user interface is provided for handling a group of screen objects. The interface establishes a viewport in a portion of the screen. The interface allows the user to define a set of planes, and to assign each object to one of the planes. A tab identifying each plane is always visible, and is used to...http://www.google.com/patents/US6404443?utm_source=gb-gplus-sharePatent US6404443 - Three-dimensional graphical user interface for managing screen objects
