Office documents embedding other objects

Create a MS Visio diagram, copy it and paste it on MS Word.

How does this work? Here's a theory.

The Visio diagram that you copied is embedded as an OLE (or whatever that MS calls it) object into the Word document. The picture to be rendered (view) is seperately created as a EMF (Enhanced Meta File, the native format for graphics in Word documents, WMF is also an option) and embedded. The left overs of this process can sometimes be seen as "foo.emf" or "bar.emf" in the C: drive.

The OLE object can be edited later by double-clicking on it.