1. An automatic calibration method for a touch screen used in conjuction with a display during interactive sessions, where the touch screen and the display have first and second sets of axes and the first and second sets of axes are asumed to substantially overlay, respectively, said method comprising the steps of: (a) displaying, prior to each of the interactlve sessions, a first point on the display; (b) obtaining first coordinates of a first touch on the touch screen at approximately the first point; and (c) generating terms in a translation matrix for translating coordinates of the first touch into coordinates.