I agree. Maybe i'm not on the same page as the article author on what he meant by "event driven" but if he's talking about websockets/comety web servers, then

I agree. Maybe i'm not on the same page as the article author on what he meant by "event driven" but if he's talking about websockets/comety web servers, then as I mentioned in a comment below, the difference is that in a traditional web server the customer has to keep calling back to know the status of the pizza (polling) versus having the pizzeria deliver or call the customer back for pickup (server push). Fewer communiques overall.