Hi NieMa
Welcome to the communities.
That depend upon how you have configured GPO link and implementation.
If you have enabled for user or group level then it will work on respective group or user.
If policy enabled on computer level then it will applay to respective computer.
If not followed below link please do that which will give you little more idea.
http://support.microsoft.com/kb/231287
"concentrate the mind on the present moment.".Image may be NSFW.
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