Auto Select application?

[eluser]anna16[/eluser]
Hi guys

I have already read this document below,
http://ellislab.com/codeigniter/user-gui..._apps.html

Now my problem is since i have multiple application that use
a single codeigniter core system.

How do i auto select each application i created.

let say when i type this address /foo/address
it redirect to /foo/ application.

and

if I type this address /bar/address
it redirect to /bar/ application.

I hope my explanation is not dense.

thanks in advance.