When you install parental controls on vista there are a few hidden items that are not displayed in the control panel. These are exemption lists for the applications and for specific web sites. Specific applications might want to be able to have free access to the web, and they set this when they are installed. Specific applications might require access to certain pages (for example help pages) and they set this when they are installed.
The HttpExemptionList is the list of applications that are allowed to run and have no limits on what they can view on the web, you should be very careful about what is added to this list since it allows unrestricted access to the web. The UrlExemptionList is the list of urls that are allowed to always be connected to. The default output you should see from this script is:
App Exemption list: c:\Windows\eHome\MCUpdate.exe c:\Program Files\Windows Media Player\Wmpconfig.exe c:\Program Files\Windows Media Player\Wmpshare.exe c:\Program Files\Windows Media Player\Wmpnetwk.exe c:\Program Files\Windows Media Player\Wmpsideshowgadget.exe c:\Program Files\Windows Media Player\wmplayer.exe c:\Program Files\Windows Media Player\Wmpenc.exe c:\Program Files\Windows Media Player\Wmlaunch.exe c:\Program Files\Windows Media Player\Wmpnscfg.exe c:\Windows\HelpPane.exe c:\Program Files\Windows Media Player\Wmprph.exe c:\Windows\eHome\ehrec.exe
Url Exemption list: http://drmlicense.one.microsoft.com http://preview.services.wmdrm.windowsmedia.com http://services.wmdrm.windowsmedia.com http://games.metaservices.microsoft.com http://images.metaservices.microsoft.com http://oca.microsoft.com http://wer.microsoft.com