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_Whether you know it or not, AutoCAD is an extremely powerful program capable of more than simply drawing lines from point to point manually. One of the great and interesting areas of AutoCAD I am particularly interested in is LISP programming. LISP is a programming language that allows you make AutoCAD run just the way you want it to and perform actions automatically. LISP routines can be very simple to extremely complex depending on what you want to try and achieve. An example would be to write a program that automatically draws stairs in section just by entering the height, number of treads and width of treads. LISP can do calculations to work out how all the information required then draw the stairs. Hopefully that gives you a quick insight into what LISP can do - it is really only limited by your imagination and I personally find it fun and rewarding.

>>>>1. AutoCAD LISP - LISP vs .pgp