There are a number of ways to refer to AutoCAD drawing objects with AutoLISP. These include the following:
- VLA-objects, returned by ActiveX functions
- Entity names (enames), returned by entget and entsel, identifying objects in an open drawing
- Handles, returned by handent, which entities retain across AutoCAD sessions
- Object IDs, used by ARX to identify objects
AutoLISP provides functions to convert from one type of object identifier to another.