10.1.3EA: Purpose of Communication between System Boundary and UC

Hello,
What is the purpose of displaying communication between a System Boundary and a Use Case? On the diagram, you can even show communication between a UC included within the system boundary.
Just trying to figure out how that would be used and why...
The tooltip on the Communication elements has:
"Defines where an actor communicates with a use case"
Thanks.

Hi,
This is probably a slightly controversial ability; but after much research we have found this is to be valid UML. The reason for this support is that some objects, depending on the context, might well need to be represented on the diagram as either a actor or a system boundary.
Take for example a computer system called "Accounting System". On some high level diagram you might want to represent this as a computer that plays a role in a usecase. At a lower level you might want display this element as a System Boundary that contains sub usecases.
Does this make sense?
Gerard

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