Hi Phil not sure if this is still a problem for you or not. I never used the keys to setup my installation, they are using windows credentials to authenticate. Under the management console select "authentication" and then click the "manage permissions" button. Here i put in my own username so i could get it working and I also added the teachers username on the teacher pc (master). It is important to add the same username(s) on all the clients as well using the management console. It is using that account to access the client pcs.
I currently have one class setup with my own pc as a master and the teachers pc as a master in that room as well. I've only just got them up and running last week. Like you though I've found documentation for this confusing and almost non-existent. Also i never used a server for mine both masters are running on Windows 7, the whole domain is Windows 7 Enterprise.
