To present the neighbors of nodes in a new window:
If the slider is -1, the depth is infinite and the full reachability tree would be laid out.
The incoming and outgoing arcs of the types specified by the arc set are followed up to the given distance to obtain the neighboring nodes.
A new Neighbors window appears, presenting all the neighbor nodes of the selected node(s), with relationships among the neighbor nodes shown by various types of arcs from one node to another.