Buffers
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A "buffer" is a Lisp object containing text to be edited. Buffers
are used to hold the contents of files that are being visited; there may
also be buffers that are not visiting files. While several buffers may
exist at one time, only one buffer is designated the "current buffer"
at any time. Most editing commands act on the contents of the current
buffer. Each buffer, including the current buffer, may or may not be
displayed in any windows.