Mikd,
Your welcome. If you or your administrator installed AutoCAD with the help sections included, I know that from version 2000 on, there is a "Developers Help" section that has a vast amount of information to help you along on your path to enlightenment in the world of AutoCAD. I know that finding something such as "atoms-family" is a bit of a stretch, but take some time out to peruse this volume as it will enrich your life as well as your soul.