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Emacs is a full screen editor which edits files in a buffer. This
means that the original file is copied into a temporary area, called
a buffer, and any changes you make during an Emacs session do not
overwrite the original file until you explicitly save your changes.
When you save a file in Emacs, the previous version of the file
is saved as a backup with a tilde (~ ) appended to its original
name. For example, say you are editing a file called foo.tex
and you save your changes. Your changes will be in a file called
foo.tex, but the original version of foo.tex
will be saved into a file called foo.tex~.
Tim Kohl
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