deny unauthenticated users

Hi,
I have multiple web applications in one domain. http://local:8080.  I want to be able to prevent unauthenticated users from being able to access any of the web applications in the domain except for the HomePage and the Login screen.
In my IIS, I have the following structure:
Site   Site Subdirectory   Mapped To   URL HOME     c:\websites\home   http://localhost:8080   BULLETIN   c:\websites\bulletin   http://localhost:8080/ ...