This class implements the IPersistStorage interface.
Your class, derived from IPersistStorageImpl.
IPersistStorageImpl implements the IPersistStorage interface, which allows a client to request that your object load and save its persistent data using a storage.
The implementation of this class requires class T to make an implementation of the IPersistStreamInit interface available via QueryInterface. Typically this means that class T should derive from IPersistStreamInitImpl, provide an entry for IPersistStreamInit in the COM map, and use a property map to describe the class's persistent data.