Check out the autocad the 2014 JavaScript API http://adndevblog.typepad.com/autocad/2013/04/getting-started-with-javascript-api-on-autocad-2014.html
Here is a YouTube video
http://m.youtube.com/watch?v=PZKKJwcke2k&desktop_uri=%2Fwatch%3Fv%3DPZKKJwcke2k