From IMDB: "The computer name WOPR used in the movie was a joke based on a real computer once used to predict war strategies at NORAD which was called "BRGR".

From IMDB: "The computer name WOPR used in the movie was a joke based on a real computer once used to predict war strategies at NORAD which was called "BRGR". The Burger King "Whopper" is a "Burger"."