1. A method for use in controlling a system, comprising the steps of: directing a first portion of a field-of-view of a camera in a first direction; directing a second portion of the field-of-view of the camera in a second direction across a screen of a display for the system; using the camera to track in three dimensions an object moving in a space in front of the screen with the second portion of the field of view of the camera; and providing input to the system based on the tracking of the object; and wherein the first portion of the field-of-view of the camera is not used for tracking the object; wherein the tracking in three dimensions is based on determining a position of the object in a video image of one of the camera and a distance between the object and the one camera; and wherein the tracking in three dimensions is based on only one view across the screen of the display of the system.