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After enabling the Gii module in your protected/config/main.php file and then try to use it with http://example.com/index.php?r=gii, you get an error:

Occasionally one wishes to set systemwide parameters for an application, such as a contact address for email, an application name, or setting an option that guides major behavior. Yii provides for setting of static parameters in the configuration file, and this article talks about how to do it conveniently.