The Data Flow report gives you a good overview of the interfaces between applications. If you hover over an interface you will see a yellow box on the right hand side with more interface context.
If you like you can put labels on the interfaces in order to see the most important information immediately. Therefore you click on "no labels" on the upper right and then you will get a list of interface attributes that are maintained in the Interface Fact Sheets and that can be selected here.
You can choose one or more Labels.