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Apps Question about accessories

Hello, I was looking through the documentation and I have a question about a sentence in the USB accessories section

I cannot post a link, but it's in the android.dev.com guide/topics/connectivity/usb/accessory.htm

"This allows Android-powered devices that cannot act as a USB host to still interact with USB hardware. When an Android-powered device is in USB accessory mode, the attached Android USB accessory acts as the host, provides power to the USB bus, and enumerates connected devices"

I feel that I may be getting my terminology mixed up, but it seems like it's saying that a device that can't act as a host can be connected but then says that when connected the device will have to be the host. I am confused by how that is possible. I plan on connecting an Arduino Nano to a Nexus 7 tablet in order to read in information from the device.

Thank you for any help.
 

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