(Excuse me for my bad English :-) )

Emacs says that I can "Type C-c TAB to visit in Info the Emacs Manual section
about when and how to write a bug report", but when I press C-c TAB — it says "C-c TAB is undefined". Please see at attached screenshot.

Emacs version       : GNU Emacs 23.1.1 (i686-pc-linux-gnu, GTK+ Version 2.12.9) of 2009-07-31
.emacs              : none
X keyboard layout   : us

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WBR, Sergey