I'm new in SLES 11 SP1. I'm trying to understand how "Extras+Show Automatic Package Changes" works in Yast / Software management. Please someone could help me about it? In particular I have following doubts:

How are calculated the packages showed in this list?
How can I see what other(s) package(s) are the reason of the dependency?
I've notice that there is a dependency between the repositories enabled & and the list of showed packages.
How can I see all these packages dependencies even though when I don't have included the repositories where these packages can be found?

Thank you in advance