It's been eight years, but as I recall during our visit to USS Texas in 2008 this was explained to us. The first thing that happens is an increase in boiler pressure. Once this is accomplished the signal is sent to the engine rooms, and engine speed is increased. If the engine speed change is attempted first it can create a vacuum in the boilers which can put the fires out. Not a good thing.
Other than that I don't think there's much more involved. Everybody knows what pressure and what revolutions are necessary for a given speed, and once the order is given they just do their jobs.
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