Abstract: A multiple information disc housing for storing optical discs and including a first housing part (3), a second housing part (5) and an intermediate third housing part (7) arranged between the first and second housing parts. The first housing part is a lid part and the second housing part is a bottom part. The lid part being provided with hinge elements formed as lid part hinge arms (31A, B). The bottom part is provided with hinge elements formed as bottom part corner recesses (37A, B). The intermediate housing part is provided with intermediate housing part hinge elements of two different kinds, (i) intermediate housing part hinge arms (39A, B) and (ii) intermediate housing part corner recesses (41 A, B). Each hinge arm extends into a corresponding corner recess and is rotatably coupled to a respective recessed hinge wall to form a corner hinge.

Abstract: A method for displaying a n-ary tree graph (30) on a display screen (100) is disclosed. The method comprises a first step of dividing the display screen (100) into one or more equally sized portions, a second step of displaying in said display screen portions at most one node (10) of said n-ary tree graph (30) and a third step of displaying in the same display portion as the node (10), the child nodes (20) of said node (10) of said n-ary tree graph (30). On the display screen (100), symbols (120, 140) corresponding to said node (10) or said child nodes (20) are displayed in the top left hand corners of the display screen portions. These symbols may incorporate visual clues (`no more room`) to indicate that said child nodes (20) themselves have child nodes (i.e. grandchild nodes) which cannot be displayed and visual clues (`no more room`) to indicate that said child nodes (20) have siblings which cannot be displayed.

Abstract: A display tool is used to simplify the display of a plurality of graphical objects on a display screen. The tool allows a user to select from an inventory of fragments which are required to build a figure. These figures can have child and grandchild elements associated with them. Each figure also has a symbol associated with it. On the display device, an overview window is produced on which graphic objects are shown in symbol form. An arbitrary subset of symbols in the overview window is selected by the user and produces a detail window showing graphical objects or symbols corresponding to the subset of symbols in more detail. These graphical objects are displayed using either their fragment form or their symbol form based on a threshold value as to eliminate overcrowding of screen space. Child and grandchild figure can be directly observed in the detail window by zooming into the selected figure.