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You can limit user actions by enabling or disabling the associated permission on the Web application. For example, if you do not want users to be able to add pages to a Web site, you can disable the Add and Customize Pages permission. When you disable a permission on a Web application, the permission cannot be assigned to any site group and, as a result, cannot be granted to any user of a site on the Web application.
To limit the permissions for a Web application:
On the top navigation bar, click Application Management.
On the Application Management page, in the Application Security section, click User permissions for Web application.
In the Permissions section, select the check boxes next to the permissions that you want to enable, and clear the check boxes next to those permissions that you want to disable.
You can select all permissions by selecting the Select All check box. You can clear all permissions by clearing the Select All check box.