[ElPrado]

I'll explain more.
You want to bet 2 tracks' first race. Naturally, you want to watch both. Before internet came along, you could not...without having multiple TV screens, cables, etc.
Now, racing secretaries can stagger gate times to let you see all of the races one after the other.
I actually had a friend that had at least 10 screens going at once, plus closed circuit of his broodmares.
He also owned 2 pool rooms. He had feed from watching the bar and the table the pros played on from each.