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Numeric Identifiers
AutoLISP functions work with numeric identifiers (IDs). Their type is real.
For example, when you use ade_dslist to list the drawings attached to the current drawing, the function returns a list of IDs, not drawing names. To get a drawing name, you call ade_dwggetsetting with two arguments: "dwgname" (the setting you want to know about) and the drawing ID.
Topology function documentation uses a number of different kinds of IDs. See Topology IDs for an annotated list. Although these IDs are all the same type, ade_id, we give them different names in the documentation according to their purpose.