Configuration files for SDL Tridion Sites user interfaces

An overview of the various configuration files that you can edit to configure the browser-based interfaces (Content Manager Explorer, and Experience Manager).

%TRIDION_HOME%\web\Web.config
ASP.NET settings that apply to all SDL Tridion Sites interfaces, graphical or otherwise. Example of settings to configure here are timeout values and handlers.
%TRIDION_HOME%\web\WebUI\Web.config
ASP.NET settings that apply to all SDL Tridion Sites interfaces that use the Content Manager Explorer application as its basis, including the Content Manager Explorer GUI itself, Experience Manager, and any custom extensions (additional tabs and screens).
%TRIDION_HOME%\web\WebUI\Webroot\Configuration\System.config
SDL configuration of the Content Manager Explorer application. These settings affect the Content Manager Explorer GUI itself.

In addition, the various custom extensions you may have built could have additional configuration files specific to that extension.