Design Plane Origin


I am reading a Bentley white paper titled "US Coordinate Systems in MicroStation v8i & Bentley Map v8i."  At the top of page 5, it states "A Microstation design plane itself is a Cartesian coordinate system with the XY origin at the center of the design plane, except when the global origin has been shifted."  I assume that the origin of the design plane corresponds to the projected origin of the map.  However, I question if there could be an additional origin introduced to the design file; a global origin, and a map origin?