Graphical JAVA features

We develop flight information software for airports, and now we need to set it up with some internet functionality. Without getting in to it too detailed, one of the main goals is to show flightinformation on several monitors, some of them clustered together showing the info of several flights at the same gate. When a plane is boarding, you see green spots flashing in front of the flight, noting that passengers should hurry to the gate to start boarding. My question now is, is it possible to not only synchronize this flashing on one monitor (eg. 6 of 10 flights already have the green dots and a 7th one is added) but on multiple screens at the same time?

And can Java control hardware? Is it possible to use the monitors functions to adjust brightness and contrast, degauss, power on and off and things like that?

I have a zillion more questions, but let's get started with these! :)