AutoCAD is a 2D and 3D CAD software application initially released in 1982 as one of the first CAD programs that could run on personal computers like the IBM PC, when most CAD software ran on large computers. It includes basic solid modeling tools but lacks some advanced capabilities. AutoCAD supports customization through APIs and its DWG file format has become a standard for CAD data sharing. It currently runs on Windows and can run on emulators for other systems. AutoCAD Architecture is a version specialized for architectural design that allows objects like walls and windows to intelligently interact.