gpupdate is a command line utility to force group policy updates. Group policy updates every 90 to 120 minutes, but sometimes you don’t want to wait that long. with this program you can do it instantly. I also show how to open a port on the windows firewall to allow you to remotely force group policy updates. To remotely update the GPO, I use a program called psexec. It’s from a company called sysinternals that Microsoft bought. You can download the entire PSTools package to get it. These things are best in a domain, but should work on a workgroup (local) machine as well. You can use them on Server 2000, 2003, 2008, Microsoft Windows, XP, Vista, and 7.

http://technet.microsoft.com/en-us/sysinternals/bb896649.aspx
commands used…
gpupdate.exe /force

gpupdate.exe /logoff

gpupdate.exe /boot

gpupdate.exe /Target:USER

psexec \\DESKTOP101,DESKTOP101 gpupdate.exe /force /boot