The IPersistStorage interface supports structured storage for embedded objects. The interface includes the following methods:
| Method | Description |
| HandsOffStorage | Requests that the object release all storage objects that its container has passed to it and enter HandsOffAfterSave or HandsOffFromNormal mode. |
| InitNew | Initializes a new storage object. |
| IsDirty | Indicates whether the object has changed since it was last saved to its current storage. |
| Load | Initializes an object from its existing storage. |
| Save | Saves an object, and any nested objects that it contains, into the specified storage object. The object enters NoScribble mode. |
| SaveCompleted | Notifies the object that it can revert from NoScribble or HandsOff mode, in which it must not write to its storage object, to Normal mode, in which it can. |
For details, see the COM Programmer's Reference in the Platform Software Development Kit (SDK).
While hosts typically look for stream persistence preferentially, it's a good idea to implement IPersistStorage anyway, to make the designer as flexible and as general as possible. A simple approach is to open a stream in the storage and save the required data.