Note to me:
They took away my displays menu, but I got it back.
http://displaymenu.milchimgemuesefach.de
Keywords: mirroring displays, os x, mountain lion, display settings, external monitor....
option-brightness: Display Preference Pane
command-decrease-brightness: Change display mode (only on revised fn keyboard layout on Alu. keyboards, newer MBP/MBs?
https://discussions.apple.com/thread/4156736?start=0&tstart=0