Dependency Network Graph Question

I have some problems in understanding the dependency network graph which is built in the association rules algorithm. My questions are:

1) Assuming an arrow goes from Node A to Node B ( A --> B), is Node A dependent from Node B or is Node B dependent from Node A?
2) Are only rules used with one element on each side of the rule (itemset size = 2) or is the graph also influenced by rules with more elements?
3) it is said that the slider on the left side is related to the probability of the rules. when viewing my rules table I don't understand why some rules are viewable later then other ones because they have the same probability. Is there another parameter influencing this slider? Which one?

I would be grateful for your help!

Regards, David

1: read it as A -> B, that means that the presence of A imples the presence of B.

2: The dep net currently only uses rules generated from two itemsets

3: I believe the slider is more the importance of the rule than the probability. A rule A->B where both occur 100% in the data isn't very interesting, so I think that's what you are seeing.