The rich edit control supports the client functionality defined by OLE. The control provides full support for most OLE client features. It does not support linking to its contents. The client is responsible for dialogs and error messages, managing storage for OLE objects, and document and application window level in-place activation support. The client can use the EM_GETOLEINTERFACE message to obtain an IRichEditOle interface from the rich edit control which allows it to manage objects. The client uses the EM_SETOLEINTERFACE message to register an IRichEditOleCallback interface that the control uses to obtain the required interfaces and storage.
The following OLE interfaces are used with rich text edit controls: