Enlighten can provide good information on links between objects

If you are trying to understand the relationship between objects and the link that is created between them in CAST, the Enlighten tool can provide much good information on the specific link and how it was created.

You can actually select the link itself and right click which gives you the options to see the properties of the link (which provides the project which created the link) as well as a code viewer to see the code that resulted in the link.  An example screenshot is shown below:

If you have lots of objects in your Enlighten view, it may be difficult to actually select the link itself.  Zooming in can help you with selecting the link.