How do I get hold of the Links that are entering and leaving a Symbol?

You can use the Symbol.EdgesEntering and Symbol.EdgesLeaving properties to get hold of the Links that are entering and leaving a Symbol. The Symbol.Edges property will get you the collection of all Links that are entering or leaving a Symbol. Once you have access to the Link, the Link.FromNode and Link.ToNode properties can be used to determine the symbols that lie on either end of the link.