You can certainly do this at the server level. You didn't mention what time of network operating system you're using, so I'll assume that it's Windows 2000 or another version of Windows Server. In this case, use group policy or System Policy Editor to set the screensaver policies. You can copy the screen saver to users' hard disks via their logon scripts or you can run the screensaver from a network location, which I don't recommend.
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