global.asax

What code whould be placed in the application_start and the session_start events in global.asax?

Can you give an example of what might be best suited to place in the Application_Start and Session_Start subroutines? I know when each subroutine is called. Application_Start when the first user first accesses the web application. Session_Start when a user opens a session with the application. But what code belongs in each of these subr...