Correct. Even more problematic is that as a packet sails from source to destination, its 'priority' may or may not (probably not) get equal treatment through each network. I doubt that AT&T will give TimeWarner's 'prioritized' packets preference over their own 'prioritized' packets. After all, AT&T would have likely sold traffic prioritization to their own customers, and can't have their speedy delivery delayed by a competitor's high-priority packets. Susan's substrate neutrality lies most in line with how the OSI layered model of networking is composed. Each layer is intended to be principally agnostic (if that term can be applied to a network layer) of the layers below and above. The layer where IP resides can have IP-V6 slide in to replace V4, and the layers above and below won't know the difference. Web browsers still fetch and display web sites, domain names still resolve, and so forth (Okay there more to it than that, but conceptually that's the idea). And, the users prinicipally don't need to know all the details of network their experiece rides on - just their experience.