In the 1983 film WarGames, David Lightman accesses the military computer system called WOPR.
WOPR stands for War Operation Plan Response. The system is a fictional strategic computer designed to simulate nuclear-war scenarios and calculate possible military outcomes. David initially believes he has connected to a game developer’s computer, but he has actually reached WOPR through a back door.
NORAD is the real North American Aerospace Defense Command, whose facility is important in the film, but it is not the computer’s name. Joshua is the name associated with the artificial intelligence created by Stephen Falken, and it is also the name David encounters during his search.
WarGames uses WOPR to explore the danger of treating nuclear strategy as a game. Its famous conclusion is that some games cannot produce a meaningful winner, a message that helped make the film a landmark in technology cinema.