I was using those as defaults to make things easy to understand.  I know they can be moved and clicked on, but that is the default location.  And clicking the bodypart on the instance list means you are guaranteed to click the right part, as a few poser character have some strange Joint mesh zoning (not sure if I am describing that right).  Vicky 3's Body part zones compared to Vicky 4's for example. 

(and I forgot about #2 part B)