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AutoLISP is based on the common LISP language, which was defined back in the late 1950's and is widely used in artificial intelligence and expert systems. AutoLISP was first introduced as part of AutoCAD in Release 9, sometime in the early 1990's. AutoLISP differs from other programming languages in that it evaluates each line of a program as it is introduced to the computer. Other languages, such as Visual Basic and C++, compile the program code into machine code that the computer recognizes.