Ashley Sheridan wrote:
I see exactly the issue you have now, and there's no way round it. You
can't identify a single machine in the way you want.

Maybe you could restrict access to test answer materials to a user who
is logged in, and then lock them out when a test is in progress for
their username. That way, you don't have to identify a machine at all
(what's to stop someone from opening up a laptop next to their main
computer to circumvent your 'security' anyway?) and the only way they
can access both course materials and the test is with two sets of login

Just to follow-up... even if one could identify the machine, someone out there would open up a virtual machine :)

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