As far as what I saw, they had walkie-talkies with the field crews on every field. As soon as a game was over, they would call in the score to the main desk. There was a guy (more like a kid - probably 19/20 from the looks of it) with a laptop and access to internet. He would then update OFC. They then updated the posterboard as well. They also had a wireless printer for the laptop to print off updated brackets on paper for you if you asked, or sometimes just had some sitting there to take.
It was pretty cool.