This policy setting allows you to control a user's ability to invoke a computer policy refresh.If you enable this policy setting users are not able to invoke a refresh of computer policy. Computer policy will still be applied at startup or when an official policy refresh occurs.If you disable or do not configure this policy setting the default behavior applies. By default computer policy is applied when the computer starts up. It also applies at a specified refresh interval or when manually invoked by the user.Note: This policy setting applies only to non-administrators. Administrators can still invoke a refresh of computer policy at any time no matter how this policy setting is configured.Also see the "Set Group Policy refresh interval for computers" policy setting to change the policy refresh interval.Note: If you make changes to this policy setting you must restart your computer for it to take effect.
System\Group Policy
Machine
At least Windows Server 2003 operating systems or Windows XP Professional
HKLM\Software\Policies\Microsoft\Windows\System!DenyUsersFromMachGP
grouppolicy.admx