In the C-h v docstring of `last-command', pressing Ret on the link

    See Info node `(elisp)Multiple displays'.

gets an error

    No such node or anchor: Multiple displays

I suppose it's a typo for "Multiple Displays", in five spots altogether
in keyboard.c.  (Search and replace if the diff is out of date.)

2010-05-19  Kevin Ryde  <user42@zip.com.au>

	* src/keyboard.c (last-command, keyboard-translate-table,
	overriding-terminal-local-map, system-key-alist,
	local-function-key-map): Docstring typo "Multiple Displays".