What purpose would this be used for?

I found it at the dollar store.

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I actually have a APC UPS at work that uses a USB-A to USB-A cable. You can look up the cable online, it's part number 940-0504. I was surprised APC used such a cable. I think if you tried to do something dumb like connect two PCs together with it, one of the USB ports would fry.
- pretty sure i tried it as a kid and nothing happened.

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