| IDispatch | Dispatch interface | 
| IEnumerable | Interface to retrieve an enumerator from a class. | 
| IEnumerator | Enumerator support interface | 
| IInvokable | Interface with RTTI associated with it. | 
| IUnknown | Basic interface for all COM-based interfaces | 
| RefAttribute |  | 
| StoredAttribute |  | 
| TAggregatedObject | Aggregated object | 
| TContainedObject | Base class for contained objects | 
| TCustomAttribute |  | 
| TInterfacedObject | TObject  descendent implementing the IUnknown  interface | 
| TObject | Base class of all classes. | 
| UnsafeAttribute |  | 
| VolatileAttribute |  | 
| WeakAttribute |  |