Bonky,
On my LAN, we have a sure cure for people that don't secure their passwords and workstations. We use internet 'tattler' software that generates a report of usage for HR and the managers. Around our site, if someone finds an unsecured WS, they use it to surf porn. Well, the smart ones do, the dumb one use their own.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.