Sitefinity limits users’ concurrent sessions so that they are not allowed to be logged in simultaneously from different browsers and machines. When trying to login to the website if there is another valid session open for a given user there will be an additional question to confirm to log out the previous session.  This setting allows you to automatically logout users out from other HTTP clients upon login.

Configure a list of domain sites that Jquery Plugins have access to (separated by commas). Each plugin verifies that if the domain is not in this list of this setting, the plugin gives an Authorization error and the plugin will not work. If this setting is left blank then any site can use the plugins.