VMWare ESX and VMM

Good %GreetingTime%,

I have what I hope is a simple question from a noob.

I see how to use the Virtual Machine Manager, and have figured out how to add ESX hosts, and can also see their corresponding guests. I understand that for each of the guests, I will have to inventory them as I would a physical endpoint e.g. install a SMAgent.

The questions I have for the hosts are these:

1. Because I have added the VMWare ESX host to the VMM console, do I need to to also add an Symantec Management Agent to the same VMWre ESX host as well? Or is it considered inventoried already, and therefore the answer is no?
2. Also What kind of a license is consumed through the VMM Manager is consumed? Does it consume any license at all..it doesn't have an SMAgent installed so I guess no license is required?

Thanks in advance.