Straight lines were smoothly rendered in real-time animation.
General principles of operation were similar to the systems used today: 4x4 transformation matrices, 1x4 vertices.
Possible uses included flight simulation (in the product brochure there are screenshots of landing on a carrier), scientific imaging and GIS systems.
Another was bought by the Port Authority of New York to develop a tugboat pilot trainer for navigation in the harbor.
The MIT Dynamic Modeling had one, and there was a program for viewing an ongoing game of Maze War.