(ROSE) uses of dependency and submit response diagrams

[RabinP]

Title: uses of dependency and submit response diagrams

Dear all
I am using rational rose version 2001 to design class diagrams using web extension features like server pages, client pages, COM components, forms.  When I re-engineered the model from the code I had written, I got four different diagrams

1. asp
2. Client composition diagram
3. Submit response diagram
4. Dependency diagram

What is the use of the submit response diagram  and dependency diagrams when I can represent everything in client composition diagram.

Thanks
Rabin