SUS on windows 2000

I have installed SUS on a windows 2000 server but my clients dont seem to update. Im using group policies and when i go to the control panel windows updates icon I can see the settings from the group policy. Should the clients still be able to go to the MIcrosoft windows updates website throught their browser and update what they want?
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Visiting the Windows Update web site is completely independent of your SUS settings. Unless you lock this update feature (can be done with a policy as well), your users will still be able to update the machines that way (if they're local administrators on their machines, that is).
Your SUS server will only be used by the "Automatic Updates" service that's running on the clients; they will download available patches using the BITS service and install them at the scheduled time (assuming you've scheduled the update).
Another word on the actual installation: Unless you use Option 4 (download and install according to a schedule) for your update settings, an administrator will have to log on to the machines and allow the installation. Option 4 is the only one that allows a completely automatic download and installation of the patches you've approved on your SUS server.
Oh, and here are lots of useful information:

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Windows 2000

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