(emacs.info) Help

 
 Help
 ****
 
    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'.  To cancel, type `C-g'.  The
 function key <F1> is equivalent to `C-h'.
 
    `C-h C-h' (`help-for-help') displays a list of the possible help
 options, each with a brief description.  Before you type a help option,
 you can use <SPC> or <DEL> to scroll through the list.
 
    `C-h' or <F1> means "help" in various other contexts as well.  For
 example, in the middle of `query-replace', it describes the options
 available for how to operate on the current match.  After a prefix key,
 it displays a list of the alternatives that can follow the prefix key.
 (A few prefix keys don't support `C-h', because they define other
 meanings for it, but they all support <F1>.)
 
    Most help buffers use a special major mode, Help mode, which lets you
 scroll conveniently with <SPC> and <DEL>.

 
* 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).
* Language Help       Help relating to international language support.
* Help Mode           Special features of Help mode and Help buffers.
* Misc Help           Other help commands.

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