 This made it possible to create ArchiCAD, the first desktop BIM system and Graphisoft's flagship product.Graphisoft's flagship product, ArchiCAD was introduced in 1987 as the Virtual Building concept, later (2003) regarded as building information modeling (BIM), and allowing architects to draw walls, windows, doors, slabs and roofs — a common feature now of every BIM-based architectural design software.Subsequent ArchiCAD releases introduced other BIM features such as Teamwork, which enabled more architects to work on the same building in parallel, edit functions in three-dimensional model views, and interoperability add-ons to communicate with other applications using IFC — now a de facto standard in data exchange between BIM applications.