If JP was recording the position value of each tick of the trading day, the size of the array would quickly exceed the memory limits of most computers in a short amount of time.
Explaining what they do tick by tick on a continuous basis has as much value as trying to come up with a rational explanation why the ball landed on the 9 on the roulette table in Bellagio instead of 10.
In short, it's probably not yet time to retire your TV, but if you spend a lot of your time away from the living room and have the bandwidth to spare, the value proposition of a pricey satellite subscription just jumped up a tick.