Wouldn't GEOS on the ol' (and much beloved) Commodore 64 qualify as prior art? http://www.symbos.de/gfx/facts/geos.gif
"The last major stumbling block the Video Game industry has to conquer is not only the most important towards getting the government off their back but also the biggest difference between the movie industry and the video game industry is enforcement. A rating system is useless unless it is actually adhered to, without that it's just noise.
FORTH IF HONK THEN