Hi Guys, I was wondering if anyone here has been able to interface their software with AutoCAD using it's api? Specifically I want to create a revisioning program that locks a released revision down to read only and creates new files for internal revisions. As far as the files go I have managed to do this fairly easily with C# & WPF. my question now is how do I extract the attributes to a db, and then be able to update & sync directly from the db (probably a csv file). I know how to create these from within AutoCAD but I was hoping to just build a button to "Extract attributes" and/or "sync attributes" within the revisioning program itself. I initially wanted to do this from PC's even without AutoCAD installed s the people who will be defining the attributes aren't the ones drawing the docs, but a RealDWG licence is like $5k + subscription which is a bit rich for the functionality I am after. So I am happy to just be able to do it with a pc that has AutoCAD installed. Another problem is we use AutoCAD LT, and I believe I read that ObjectARX only works with the full version (We may have one licence in the company, might be able to set up a server to handle these "requests"). I am hoping someone knows how to extract/write attributes and can point out to me what I need to do? I have had little luck in my research. Hoping to maybe use the .NET libraries or something? I am struggling to find useful info about using the api, also I don't have access to a machine with AutoCAD installed to actually look through the software/test stuff for a while yet (away on site work) This is proving more difficult to work out than it should need to be. All help is much appreciated Cheers.