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I have few .arx applications for AutoCAD. In these applications few are menu based and others are command line. Now what I am trying to do is, Load the .arx app, run it and then unload it once the .arx application runs through a LISP command. .arx applications run once the user clicks on the tabs that are provided. .arx applications are written in VC++. Now I have a lisp file, which gets loaded once the user starts AutoCAD. In the lisp files I have declared these functions for various .arx applications; (defun c:XYZ_program() (command) (command) (arxload "C:/ABC/XYZ.arx") (command "XYZ_program") (arxunload "XYZ.arx") ) It works fine for Programs which need input data from Menu based forms, but says error unloading xyz.arx for programs which need command line input. I was wondering if there were any commands in LISP that will make sure arxunload "XYZ.arx" will execute only once (command "XYZ_program") is executed. I am not sure on how to approach this problem. Any help with the same would be greatly appreciated. I have also discussed this question with others in the following link, but did not find much of help. http://stackoverflow.com/questions/17602443/loading-and-unloading-the-arx-file-with-lisp You can have a look at it, just to gather some information, in which direction were we heading.

Hello everybody, several years ago, when programming in C language for AutoCAD just was possible in "Watcom C", I wrote some ADS applications. Now, please guide me how to start ARX programming by answering to these questions: 1- Which version of Visual C is needed to make applications in AutoCAD R2010, 2011, and 2012. 2- Is there any help or "know how" document to do it step by step? 3- Is there any better method(s) to do the task of making windows (forms) as well writing object oriented codes? Thanks in advance:).