When you don't have internet, just try take a look at /usr/share/doc and /usr/share/info directories.

And read the man pages with "man " at terminal.

(The "tkinfo", "xman", and "dwww"(runs at localhost) programs are alternatives and you can expand that documentation, installing docs available with synaptic.)

Or type "ctrl-h i" when using emacs.

Also, take a look at the configuration files in /etc, or go deep in the source code ...

(then try the some with other OS)

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