The system-display box is where a three-dimensional pictorial view of the design is displayed. The box is continuously updated as components are added to or removed from the design, and as the design is modified in other ways. The user can modify the displayed design directly with the mouse or can use the Main toolbar to interact with and display different views of the system as well as modify its properties. A popup menu for interacting with the design and modifying further the way that it is displayed, is shown by right-clicking the mouse on the System-display box.