This book isn’t release-specific, although AutoCAD 2007 is used throughout for the graphics. Many offices don’t upgrade immediately to new releases, and I understand why. Upgrades cost money and take time, and the law of unintended consequences often kicks in at exactly the wrong time. Most of the material in this book applies to any release of AutoCAD or AutoCAD LT. Where it doesn’t, I make that clear. The most obvious distinc- tion occurs in Chapter 3, “Customizing AutoCAD’s Interface,” because of the introduction of the Customizable User Interface in AutoCAD 2006 | AutoCAD SECRETS EVERY USER SHOULD KNOW QsrBEX SERIOUS SKILLS. Autodesk Autodesk Authorized Publisher Authorized Author AutoCAD SECRETS EVERY USER SHOULD KNOW DAN ABBOTT 1807 J WILEY 2007 WILEY PUBLISHING .