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Some of the APC units come with software you can load into the computer. I think you need to run a separate USB cable from the UPS to the computer. When the power goes out, the UPS signals the software, which in turn does a clean shut-down of the computer.
Not sure how well it works, or how it handles unanswered "Do you want to save?" dialog boxes. I was supposed to load my software, but never got 'round to it.
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