[K12OSN] Freezing/Pausing Student Programs in Mid-Use

[Henry Burroughs]

I was reading my "Linux Server Hacks" book and found a cool way to
freeze clients using root:

skill -STOP -u <username>

That causes all processes that belong to the user to freeze.  You can
restart the user by:

skill -CONT -u <username>

It beats trying to run xscreensaver and remotely locking the other
computers (there are easy ways to disable/defeat that... I found out
pretty quickly as I battled students one day).

Henry Burroughs
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