AutoLisp is the API for the proprietary computer-aided design system, AutoCAD. Like Emacs, it is a dynamically-scoped implementation of the LispLanguage. It lacks a macro system or let bindings. Aside from the core language, most of the primitive functions are for geometry or the manipulation of graphical entities in AutoCAD. The properties of these graphical entities are revealed to AutoLISP as association lists in which AutoCAD “group codes” are paired with values that indicate properties such as points, radii, colors, layers, and linetypes. Since 2000, the owner of AutoCAD, Autodesk, has replaced AutoLisp with Visual LISP (previously “Vital-LISP”), a superset of AutoLisp with hooks for Visual Basic, ActiveX, C++ compilation and .NET support.