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### 10.2 Documentation for a Key

The help commands to get information about a key sequence 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`’.

`C-h k key` is similar but gives more information: it displays a help buffer containing the command’s documentation string, which describes exactly what the command does.

`C-h K key` displays the section of the Emacs manual that describes the command corresponding to key.

`C-h c`, `C-h k` and `C-h K` work for any sort of key sequences, including function keys, menus, and mouse events. For instance, after `C-h k` you can select a menu item from the menu bar, to view the documentation string of the command it runs.

`C-h w command RET` lists the keys that are bound to command. It displays the list in the echo area. If it says the command is not on any key, that means you must use `M-x` to run it. `C-h w` runs the command `where-is`.