[OS X TeX] "Hijacking" a thread

[BenBehr]

On 04.11.2008, at 13:31, Charilaos Skiadas wrote:

> On Nov 4, 2008, at 6:27 AM, Alain Schremmer wrote:
>
>> Guilty as charged. In fact, I am a repeat offender.
>>
>> But why would an identifier be hidden?
>
> Actually emails have quite a lot of other stuff in the header than  
> the in-reply-to header. If you use Apple's Mail.app, you can go to  
> "View -> Message -> Long Headers" or shift-command-B to view all the  
> headers,

For some reasons the keyboard shortcut dose not work for me. Do I need  
to enable the shortcut first?
Thanks,
Ben