In sequence diagrams, you can reference an interaction from the
body of another interaction for the purpose of visual representation. This
reference is called an interaction use. You can then reuse the definitions
in an interaction to abstract and simplify your application.
You can add and modify interaction uses in sequence diagrams to visually
represent interactions in applications.
You can double click an interaction
use to open the referenced interaction in another sequence diagram. if you
delete an interaction use, the referenced interaction remains intact.