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"As well as any human beings could, they knew what lay behind the cold, clicking, flashing face — miles and miles of face — of that giant computer. They had at least a vague notion of the general plan of relays and circuits that had long since grown past the point where any single human could possibly have a firm grasp of the whole."(C) Isaac Asimov, The Last Question.
Conceived by James Clerk Maxwell in 1867, the demon exploits the random thermal motions of the microworld. It might watch a tiny ball on a spiral staircase, waiting for it to randomly hop up a step and then slam in a barrier to stop the ball moving down again. If the demon keeps doing this the ball keeps climbing. The potential energy of the ball could then be used to drive an engine.and regarding the implementation:
Finally, enter the demon, whose eye is a camera and brain a computer that controls the electric field. Whenever the rotor makes some progress in turning against the torque, the demon shifts the electric field so that the rotor suddenly finds itself nudged onto the top of that "step". This keeps happening, and the overall effect is to gradually climb the staircase.
As it does, the rotor gains energy. Crucially, though, the demon need pump no energy into the rotor, only information about the position of the rotor, which it uses to switch the field.