Customization
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This chapter talks about various topics relevant to adapting the
behavior of Emacs in minor ways. See `The Emacs Lisp Reference Manual'
for how to make more far-reaching changes.
Customization that you do within Emacs normally affects only the
particular Emacs session that you do it in-it does not persist between
sessions unless you save the customization in a file such as `.emacs'
or `.Xdefaults' that will affect future sessions. Note:Init File.
In the customization buffer, when you save customizations for future
sessions, this actually works by editing `.emacs' for you.