Using CustomAction to modify system pages in Microsoft Sharepoint Server

Chris O’Brien’s wrote a great article about, customizing the _layouts/settings.aspx page with CustomActions http://www.sharepointnutsandbolts.com/2007/07/using-customaction-to-modify-system.html For example <Elements xmlns="http://schemas.microsoft.com/sharepoint/">   <CustomActionGroup    Id="CustomActionGroupAdminSetting"    Description=""    Title="$Resources:Resources, CustomActionGroupTitle"    Location="Microsoft.SharePoint.SiteSettings"    Sequence="9" />   <CustomAction