The online System Variable database for AutoCAD was completed yesterday (the last of the descriptions were added). Today the complete PDF of the system varaiables has been updated and uploaded, which is the first time in about 3 years ago. The PDF is an almost identical version of the online database with a few differences. The differences are that all content on the variables can be viewed from a single source (kind of obvious) and the PDF does not list which variables trigger the change system variable event handler. If you find any problems with the content, please let me know.
You will need to login/sign-up on the website to download the PDF. Signing up is free as always.