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The security lock slot is located at the bottom of the monitor. (See Security lock slot). For more information on using the Kensington lock (purchased ...
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It's called a Kensington lock, or Kensington security slot, and it provides an attachment point for a cable to prevent your monitor from being moved or stolen.
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Why is this article called "Kensington Security Slot"? Is that name in common usage? I have never heard it personally. Does Kensington has a patient on it?