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You can use a Kindle by drag&drop PDF files onto it. If you use it like that, there is no need to connect it to the Wifi at all. I use my Kindle like this.
This is news to me, is that really true for all Kindle models? Can you really load files onto it as a connected storage device? Can you point to any amazon docs explaining this? I was under the impression that this was the big caveat restriction with amazon.
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Another cool thing is Calibre recognizes the Kindle. :)