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Documentation for a Key
The most basic `C-h' options are `C-h c' (`describe-key-briefly')
and `C-h k' (`describe-key'). `C-h c KEY' prints in the echo area the
name of the command that KEY is bound to. For example, `C-h c C-f'
prints `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.
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