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dlloyd is correct, ultimately.
Though bobw's firewall suggestions will handle many of the alternate products since they must communicate with the AIM server on a specific port (not sure about the web alternatives). But external proxie servers would allow connections through alternate ports...
The best way to handle it is to make the computer usage policy clear (regularly even) and play no favorites. Two warnings, one office administrative action, and finally, termination.
Not allowed on office premises! Can be fired for this!
(or the equivalent student punishment = banishment from the labs)
Make the policy clear and well known.
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