"When using it in the Mac OS X environment, there are two ways you can use the screen real estate of the 12wx or any Cintiq: as a supplementary area of your main desktop or as the main screen of your OS X desktop (meaning your main screen becomes the secondary monitor). PC users have it easier because of the way Windows programs and menu bars work as opposed to the Mac OS. In PC programs, the menu bar (i.e. the “File, Edit, View… etc.”) of any program is embedded into the window of that program."
Read the whole thing here.