When you use the Web Site Administration Tool, you manage the settings in a Web.config file for a single application and ...

When you use the Web Site Administration Tool, you manage the settings in a Web.config file for a single application and its subdirectories. The Web Site Administration Tool displays settings that are inherited from configuration files that are higher in the hierarchy, if applicable. If an inherited setting has been defined in such a way that the setting cannot be overridden, the Web Site Administration Tool displays the setting as a dimmed option.