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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.

I have been using autodesk architecture for some years now and recently have been hearing and seeing a lot about revit architecture. what intrigues me is why does autodesk promote revit above autocad or why the shift from cad base to revit? would appreciate some sort of feed, thanks for any clarification.