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  • It's not clear what you're trying to do here. Please see What's the difference between a buffer, a file, a window, and a frame? so that we're all sure we're using the same terms in the same way. Commented Mar 16, 2017 at 18:54
  • Sorry for that, after read that question, I have known that what I mean is buffer. Commented Mar 17, 2017 at 0:56