Determines when security policies are updated. This setting affects all policies that use the security component of Group ...

"Determines when security policies are updated.

This setting affects all policies that use the security component of Group Policy, such as those in Windows Settings\Security Settings.

It overrides customized settings that the program implementing the security policy set when it was installed.

If you enable this setting, you can use the check boxes provided to change the options. If you disable this setting or do not configure it, it has no effect on the system.

The "Do not apply during periodic background processing" option prevents the system from updating affected policies in the background while the computer is in use. Background updates can disrupt the user, cause a program to stop or operate abnormally, and in rare cases, damage data.

The "Process even if the Group Policy objects have not changed" option updates and reapplies the policies even if the policies have not changed. Many policy implementations specify that they be updated only when changed. However, you might want to update unchanged policies, such as reapplying a desired setting in case a user has changed it."