AcRxObject AcApDocManager
class AcApDocManager : public AcRxObject;
acdocman.h
The AcApDocumentManager object is the container for all the document objects (there is one document object for each drawing that is open and being edited). There is only one instance, which can be obtained using the macro named acDocManager.
AcApDocument, AcApDocManagerReactor, AcApDocumentIterator