Is anyhthing known about the internals of it, i.e. what code does it use? Something like SetDeviceGammaRamp on Windows? Or does it talk directly to the video card driver (if that is even possible in a generic way)? Or the monitor? Does it still work reasonably if I already have set my display to low brightness etc?

edit also wondering: it cannot know if I'm sitting in a completely dark room, a sunlit room or a room at night with fluorescent lighting. Don't such factors change what the ideal color would be? (not that I am constantly adjusting my display now according to the amount of clouds outside, just wondering what it does exactly. There's like no info whatsoever?)