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PDF Tools is, among other things, a replacement of Emacs's DocView for PDF
files. The key difference is that pages are not pre-rendered by
e.g. ghostscript and stored in the file-system, but rather created on-demand and
stored in memory. This rendering is performed by a special library named, for
whatever reason, poppler, running inside a server program. This program is
called epdfinfo and its job is to successively read requests from Emacs and
produce the proper results, i.e. the PNG image of a PDF page.
Actually, displaying PDF files is just one part of PDF Tools. Since poppler can
provide us with all kinds of information about a document and is also able to
modify it, there is a lot more we can do with it.
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