The Magician steps away from the PC and asks an audience member to fully examine the windows calculator. Once he is convinced that it works properly, the Magician gives him a sealed envelope containing a prediction that will then be used to cover the calculations on the computer screen. The Magician then tells the spectator to do his own mathematical equation, using any random numbers. When the spectator decides he has finished, he presses the enter key to get the result, which he will find is equal to the prediction. This effect can be done on any PC that has a Microsoft Windows Operating System (version 95, 98, NT, 2000, or XP). Important points: Any PC can be used--The calculator can be fully examined at any time--The Magician NEVER touches the PC mouse, or keyboard--An incredible (non mathematical) mechanism is used--Easy to do. No sleight of hand; leaving you to concentrate on presentation!