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I have a used mac book pro and have to reinstall the OS from remote disc. My question is: is the remote disc in this case (OS install) hosted by Apple or is it hosted by some other users' laptops?

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Remote Disk is a method for sharing another user's CD/DVD drive over your local network, if your own Mac doesn't have an optical drive. It's not a method for installing an OS onto a blank Mac.

For that you would use Internet Recovery to reinstall your OS from scratch;
hold Cmd ⌘ Opt ⌥ R at the boot chimes.
This will load the image directly from Apple.

See Apple KB: How to reinstall macOS

  • According to discussions.apple.com/thread/2002127 it can be use to RE-install Mac OS, but as Tetsujin said, not onto a blank Mac. (Obviously if the Mac is blank, there's no Finder window to hold the remote icon!!) – WGroleau Nov 21 '17 at 16:42

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