This policy setting allows you to specify a list of web sites that will be allowed to open pop-up windows regardless of the Internet Explorer process’s Pop-Up Blocker settings. If you enable this policy setting you can enter a list of sites which will be allowed to open pop-up windows regardless of user settings. Only the domain name is allowed so www. contoso. com is valid but not http://www. contoso. com. Wildcards are allowed so *. contoso. com is also valid. If you disable this or do not configure this policy setting you will not be able to provide a default Pop-up Blocker exception list. Note: You can disable users from adding or removing websites to the exception list by enabling “Turn off Managing Pop-up Allow list” policy.