IE9 - Group Policy Perference
Using Internet Explorer Maintenance Extension Ref: http://technet.microsoft.com/en-us/library/gg699413.aspx Choosing Preference mode By default, IEM is in Normal mode. In Normal mode, you can configure IEM settings so that they are refreshed on users' computers on a periodic basis (or each time the users log in). However, users can temporarily change these settings between the times scheduled for their setting refresh. For this reason, these settings in Normal mode behave as "pseudo-policies." In Preference mode, you can configure IEM settings, but allow users to change these settings later by using the Internet Explorer 9 user interface. Preference mode also exposes several additional advanced settings that you can configure. Unlike the pseudo-policies you configure in Normal mode, the settings you configure in Preference mode are true preferences. In this regard, IEM settings work similarly to Internet Explorer Settings items in Group Policy preferences.