The Embed- base class is a parent to other classes that, by design, are never to be used as top-level structures. No saved instances of concrete Embed- classes ever exist. A class derived from the Embed- base class is used only for embedded clipboard pages. Developers can create rules that apply to embedded instances and execute on the clipboard instances of the Embed- class, but the embedded instance is either saved as a page within another object or is not saved at all.