OBIEE 11g Architecture

Hi Friends this is my first Post………………..

We need to understand the architecture how each and every component is connected internally.
We have two logical set of components here
1.weblogic domain
2. OBIEE domain.
 OBIEE domain contains all OBIEE components and weblogic domain contains
Two different components
1.Enterprize manages (i.e this we need to use to control obiee components)
2.weblogic console(i.e. this we need to use to create group ,users )