You can use the Desktop library to save the state of Emacs from one session to another. Saving the state means that Emacs starts up with the same set of buffers, major modes, buffer positions, and so on that the previous Emacs session had.
To use Desktop, you should use the Customization buffer (see section Easy Customization Interface) to set desktop-enable to a non-nil value,
or add these lines at the end of your `.emacs' file:
(desktop-load-default) (desktop-read)
The first time you save the state of the Emacs session, you must do it manually, with the command M-x desktop-save. Once you have done that, exiting Emacs will save the state again--not only the present Emacs session, but also subsequent sessions. You can also save the state at any time, without exiting Emacs, by typing M-x desktop-save again.
In order for Emacs to recover the state from a previous session, you
must start it with the same current directory as you used when you
started the previous session. This is because desktop-read looks
in the current directory for the file to read. This means that you can
have separate saved sessions in different directories; the directory in
which you start Emacs will control which saved session to use.
The variable desktop-files-not-to-save controls which files are
excluded from state saving. Its value is a regular expression that
matches the files to exclude. By default, remote (ftp-accessed) files
are excluded; this is because visiting them again in the subsequent
session would be slow. If you want to include these files in state
saving, set desktop-files-not-to-save to "^$".
See section Remote Files.
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