Thanks for the feedback. You all are supporting the conclusion I have reached.
One additional clarification, since I am still new at the ISY and home automation. Oh the HP website it says the software is loaded on the ISY Hub. The conclusion I reached is the "Hub" would be a Polisy node server. It is not referring to the ISY994ZW. I could not find the term "Hub" anywhere on Universal Devices web pages, so I am assuming it is a generic term for a server.