A full-featured 2D and 3D CAD program for DOS, Windows, Mac and Unix workstations from Bentley Systems, Inc., Exton, PA (www.bentley.com). Created in 1984, MicroStation is a high-end package used worldwide in environments where many architectural and engineering designers work on large, complex projects. MicroStation TriForma (formerly MicroStation Modeler) is a superset of MicroStation that provides solid modeling, and PowerDraft is MicroStation's production drafting suite of tools. MicroStation has also been marketed by Intergraph as the software for its proprietary workstations. See solid modeling.