No need for any wireless to read your books once the files have been copied into the Kindle's "documents" folder.
Books listed as being in the "Archives" exist in your account, but not on your Kindle, and you have the option of downloading them directly via WiFi/3G if connected, or downloading a copy from the Amazon website via your computer's browser and "sideloading" the file onto your Kindle via USB.
The DRM links the files to a particular device, and a copy is also kept at Amazon for you to re-download at any time.
Books downloaded for your hardware Kindle will not work for your Kindle for PC/Mac app and vice versa (unless they're one of the rare DRM-free books) for this reason, so you can't just drag and drop your books from one to the other and will have to download a separate copy for each (unless you strip the DRM).
Hope this helps.
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