UML - use case diagrams

Question

I'm creating a chat application based on web services. I want to draw a use case diagram for my application. My problem is when i'm drawing the use case diagram should i indicate web service ? if i want how to indicate that?

Answer 1

You show it as a boundary enclosing the use cases. The actors are outside. It's a common use to put primary actors to the left of the boundary and secondary ones to the right.