An apparatus for moving graphical objects including a display for displaying multiple graphical objects according to a display priority, apparatus for moving, responsive to a user input, a displayed graphical object, and apparatus for modifying, responsive to a user input, a display priority of the moved...http://www.google.fr/patents/US5546524?utm_source=gb-gplus-shareBrevet US5546524 - Method and apparatus for interlocking graphical objects
Method and apparatus for interlocking graphical objects
