Thanks! I had tried everything but CIM_PhysicalPackage, which gives you the model and the serial number. CIM_MediaAccessDevice gives you the size.
Were you referring to the diagram in "Intel AMT WS-Management Flows.pdf"?
That's also a valid place for the diagram I used, but I actually got to it in a different manner.
I actually looked at the WS-Managment Class Reference. Probably the quickest way to get there is if you open the index.html in the DOCS folder of the SDK, then select the WS Management Class Reference hyperlink (the top level of the reference is actually the index.html file in the DOCS/WS-Management_Class_Reference folder, but that's kind of buried and easy to miss).
Anyway, the class reference has an expandable menu of CIM classes by interface (like Hardware Asset), I find it a little easier to use that then the Flows.pdf when I'm searching for information.
Andy