One-Click Clusters

I've read all the pages about one click clusters on Nimbus:

http://www.nimbusproject.org/docs/2.8/clouds/clusters.html

There isn't a lot of detail. In particular, I'd like to better understand the meaning/implications of the various xml tags in the cluster launch. Where can a person find more detail?

I'm pretty sure that what I want to do is trivial. I want to launch a cluster of GridAppliance workers. I've already got all my images and can launch individually via the cloud-client, but I'd like a one-click cluster launch. I don't think that I need any contextualization. Even though what I want to do might be trivial, I still want to learn some of the details of the technology.

1) How to launch a one-click cluster of grid appliance workers
2) How to get more details on this technology?

Please look at http://www.nimbusproject.org/docs/2.8/clouds/clusters2.html (note the '2' in the link)