The Send to Kindle program (or browser addon) is essentially the same thing as emailing documents to your kindle's email address. It still goes to Amazon's servers to be pushed to the device in question. It certainly doesn't go directly to your device through local wifi as suggested earlier. It just doesn't rely on email to GET to Amazon's servers in the first place. So far as I know, the same no AZW3/KF8 rules apply to Send to Kindle--just like the email/conversion service.
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