How to communicate Configuration file from WebPages.......

Question

A .config can contains as many as u can in an application But, one folder allows u only one .config file 

Here starts confusion...

Example :- 

An application name "TEST", It contains a web.config file which can control our application.

Now, iam created folder named as "Admin" and also another admin.config file in the admin folder.

how can i specify a call to tag from admin.config file from admin folder.

Give me an explanation with answer