[cisco-voip] CSS and Partition CM Training Material?

[Dane]

A long time ago I came across a diagram that showed how things like
CSS and partitions related within CM.  I have been unable to find it
again and need to as I need to train someone on CM basics.  Need them
to understand the big picture, but mainly they will focus on phone
setups and stuff.

Anyone know of any good free/legal reference material to download?
Needs to be more highlevel overview if you will and not detailed.  I
will handle the details for the things I want them to work on.