The Dependency Results Dialog shows the prerequisites and dependents of an actor.
The prerequisites of an actor are the upstream actors that have outputs that can send data to the input of the actor.
The dependendents of an actor are the downstream actors that have inputs that can receive data from an output of an actor.
To enable the Actor Dependency Analysis, in vergil select Utilities -> Analysis and drag the DependencyHighlighter attribute to the actor and drop the attribute on the actor. The right click context menu of the actor will then get several menu choices including "List dependents & prereqs".