[File name] Web.config [File description] The Web.config file for an application subdirectory contains settings that apply to this subdirectory and inherit downward through all of the subdirectories in its branch. [Configuration level] 
ASP.NET application subdirectory
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A S P . N E T a p p l i c a t i o n r o o t d i r e c t o r y
A S P . N E T a p p l i c a t i o n s u b d i r e c t o r y