The rigiedit program is a graph editor whose user interface is based on windows, menus, color, and the mouse pointer. You use rigiedit to traverse and modify the graph model represented in the input file. The nodes of the graph are displayed as squares and the arcs are displayed with lines.
To manage the complexity of the graph for large information spaces, you identify clusters of related nodes and collapse them into subsystem nodes. By recursively applying this subsystem composition operation, you form a subsystem (containment) hierarchy. The editor can present specific levels in this hierarchy as well as the tree-like structure of the hierarchy itself in separate windows.