This window allows you to browse the dependency relationships within the knowledge base.
Click on a topic to highlight both its antecedenal and postcedenal dependencies.
The window has a popup menu (right mouse click) to control its behavior:

Zoom in. Make everything look bigger.

Zoom normal. Return to original size.

Zoom out. Make everything look smaller.
Horizontal Orientation. Topics are shown in rows of decreasing dependency level with highest level topics at the top and the lowest (elemental data) at the bottom. This is the default orientation.
Vertical Orientation. Topics are shown in columns of decreasing dependency level with highest level topics at the left and the lowest (elemental data) at the right.
Show all topics. When this option is checked all topics in the knowledge base are shown. When it is off only the topics connected to the selected topic are shown.