Understand can generate graphs that show the hierarchy of an architecture, or just a sub-hierarchy. These graphs can be saved as PNG, JPEG, SVG, or they can be saved directly to Visio for further editing.
The dependency graphs include a customizer pane. This allows you to modify the graph display by controlling expansion, highlighting, and arrows on a per-node basis. Node children and Edges coming in and going out are easy to see and identify using the customization provided.
For example, the following graph shows the files that are "depended on by" zlib\contrib using red edges, and the files that zlib/contrib "depends on" with blue edges. The dependencies for the other files are still visible, but are faded out to allow easier viewing for the node you are interested in.
Each node that is drawn as a 3D box in the above image, can also be expanded to show its child nodes, such as zlib/contrib and zlib/examples.
Detailed graph functionality can be seen in the Dependency Graphs video.