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(emacs)Key Help

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Documentation for a Key
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   The most basic `C-h' options are `C-h c' (`describe-key-briefly')
and `C-h k' (`describe-key').  `C-h c KEY' displays in the echo area
the name of the command that KEY is bound to.  For example, `C-h c C-f'
displays `forward-char'.  Since command names are chosen to describe
what the commands do, this is a good way to get a very brief
description of what KEY does.

   `C-h k KEY' is similar but gives more information: it displays the
documentation string of the command as well as its name.  This is too
big for the echo area, so a window is used for the display.

   `C-h c' and `C-h k' work for any sort of key sequences, including
function keys and mouse events.