The settings you are looking for are under User Configuration
\Administrative Templates\Control Panel\Display
Create and link a GPO to the OU where the user accounts reside. Set
"Screen Saver Timeout" to 1800 (in seconds). You should also enable
"Screen saver" and specify one in "Screen saver executable name"
otherwise users can just select '(none)' an you accomplish nothing.
HTH
--
Cheers,
Marin Marinov
MCT, MCSE 2003/2000/NT4.0,
MCSE:Security 2003/2000, MCP+I
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