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Cory Doctorow, May 4, 2009 10: 08 PM Here's a good explanation of the workings of the "watchclock," a device carried by watchmen in order to allow their employers to check up on their patrolling.
He visits every checkpoint and clicks each unique key into the watchclock.
The key, literally, to the watchclock system is that the watchman is required to "clock in" at a series of perhaps a dozen or more checkpoints throughout the premises.