The Preferences, Plot, and Utility Objects

Understand the AutoCAD Object Model

Access the Object Hierarchy

 

ActiveX and VBA Developer's Guide > ActiveX Automation Basics > Understand the AutoCAD Object Model > 

Use New AutoCAD Features

If your Automation project uses a feature that was not in a previous AutoCAD version, you must explicitly declare the AutoCAD interface you are using in the project.

If an Automation project contains explicit declarations of interfaces that are new in a specific version of AutoCAD, do not use that project with earlier versions of AutoCAD.