Chapter 7 -- OBJECTS Section
IDBUFFER

The following group codes are used by IDBUFFER objects. In addition to the group codes described here, see "Common Group Codes for Objects." For information about abbreviations and formatting used in this table, see "Formatting Conventions in This Reference."

IDBUFFER  group codes
Group codes Description

100

Subclass marker (AcDbIdBuffer)

330

Soft pointer reference to entity (multiple entries may exist)

The IDBUFFER object is a utility object that is just a list of references to objects.