On Sat, 17 Jul 2010 13:57:41 +0200, Sebastian Rose <sebastian_rose@gmx.de> wrote:
> 
> Eric S Fraga <ucecesf@ucl.ac.uk> writes:
> > Sebastian, 
> >
> > Emacs, at least since v22 or maybe longer, has a built-in function
> > "toggle-truncate-lines".
> 
> ...which is bound to what key?

Not bound anywhere by default as far as I can tell.  I bind it to "\C-c t":

(global-set-key "\C-ct" 'toggle-truncate-lines)