AcRxObject AcDbTransactionManager AcTransactionManager
class AcTransactionManager : public AcDbTransactionManager;
actrans.h
There is a single object of class AcTransactionManager created by the ObjectARX system when AutoCAD first starts up. This AcTransactionManager object is globally available to all ObjectARX applications. The macro actrTransactionManager returns a pointer to the system AcTransactionManager object to allow access to its member functions.
The system AcTransactionManager object is used to start, end, or terminate transactions. In addition, it provides functionality to manage transactions and the objects within them.
For more information on the transaction mechanism, see the transaction section in the ObjectARX Developer's Guide.
AcTransaction, acdbOpenObject