An object is the main building block of the AutoCAD. ActiveX. interface. Each exposed object represents a precise part of AutoCAD. There are many different types of objects in the AutoCAD ActiveX interface. For example:
The objects are structured in a hierarchical fashion, with the Application object at the root. The view of this hierarchical structure is referred to as the Object Model. The Object Model shows you which object provides access to the next level of objects.