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   Emacs provides extensive help features accessible through a single
character, `C-h'.  `C-h' is a prefix key that is used only for
documentation-printing commands.  The characters that you can type after
`C-h' are called "help options".  One help option is `C-h'; that is how
you ask for help about using `C-h'.

   `C-h C-h' prints a list of the possible help options, and then asks
you to go ahead and type the option.  It prompts with this string:

     a b c f i k l m n p s t v w C-c C-d C-n C-w.  Type C-h for more help:

You should then type one of those characters.

   Typing a third `C-h' displays a description of what the options mean;
it still waits for you to type an option.  To cancel, type `C-g'.

   `C-h' means "help" in various other contexts as well.  For example,
in `query-replace', it describes the options available.

* Help Summary
Brief list of all Help commands.
* Key Help
Asking what a key does in Emacs.
* Name Help
Asking about a command, variable or function name.
* Apropos
Asking what pertains to a given topic.
* Library Keywords
Finding Lisp libraries by keywords (topics).
* Misc Help
Other help commands.

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