1. A method of using a computer system through a gesture-based human machine interface, the method comprising: pointing to a position on a screen of the computer system using an object to point; capturing images of a space in front of the screen with at least two cameras, the space including the object; analyzing the images using a processor to identify the object, to determine the position on the screen to which the object is pointing, and to determine a distance of the object from the screen; and modifying information displayed on the screen in response to the determination of both the position on the screen to which the object is pointing and the distance of the object from the screen.