The WSUS NG may be able to answer your questions:
(web client)
http://www.microsoft.com/communities...pdate_services
"Benjamin708" <> wrote in message
news

0D7018A-3916-4225-A710-...
> Hello. I am running Windows 2000 Server SP4. I have a WSUS server that
> installs updates. But on one server they would not install. I did some
> troubleshooting and got it to install via going to Windows Update site.
>
> My question is this. The group policy is set to install updates at 10:00PM.
> The WSUS still shows this update as needed. Will this update be reinstalled
> and reboot the server? Or is WSUS smart enough to not bother installing an
> update that was manually installed?
>
> Thanks.