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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