Transport Framework for WebDynpro

Hi,

Can someone tell me how the Transport Framework actually works in WebDynpro. Can you deploy (to Production J2EE Engine/ Test J2EE Engine etc ) only at the Application Level and not at the Project Level.

In other words, If a WebDynpro project has 3 applications, I dont want to deploy all 3 applications everytime. Only the application I change I want to deploy. I know there is a option "Deploy and Tun Application" but I saw it builds the .ear file at the project level. Does this mean that everytime the whole project is deployed to the J2EE engine ? Can we deploy only a application ?

Thanks