A team selects their opponent and whether that opponent is on offense or defense. If the opponent is on offense it returns the probability they will pass or run given the selected scenario (down, distance, score) and where on the field the play is typically directed. If the opponent is on defense it recommends where your team should run or pass the ball based on yards allowed in that scenario.
The NFL now uses Microsoft Surface's on the sidelines to view photos. I wonder if teams are permitted to use something like this to inform play calling. I am sure Aaron Rodgers would appreciate it.