I'm cleaning out some old junk, and stumbled onto a cable like this:
From my understanding, the USB A connector is for the host device, and 2 host devices can't communicate. So what could it be used for?
The most common use of A to A USB cables that I have seen are direct computer-to-computer file transfer utilities.
However, there are a variety of peripherals that use A to A connectors. Here is a video I saw today using one.
Additionally, there are some devices - the ones I have seen are audio/video related - that use USB A to A. I have seen surround sound receivers with USB A connectors that are used for both reading flash drives, as well as being hooked up to a computer for configuration.
Not that this particular cable is expected to be used for this purpose, but I have a similar cable which is used to connect a Chinese-made laser cutter to the USB port of a computer. The connection on the cutter is to a controller module, which also has a different USB port dedicated to use with a flash drive. This would imply that the PC connected port is configured differently than the flash drive port. Host to host perhaps.