[AUCTeX] auctex and emacs on Mac OsX

[vincent poirriez]

Hello every body

I need some help as I'm switching from linux to Mac Os X, my every  
day tool is emacs + auctex

I have searched and tried several solutions but I don't find a fully  
compliant one.

Here is what I use:
(/Applications/Emacs.app/Contents/MacOS/Emacs)
GNU Emacs 23.0.0.2 (i386-apple-darwin8.6.1, *Step 9.0-pre3) of  
2006-06-13 on jinpym.local

And I download and compile the last version of auctex

Here are my two problems
a) How to write the so used character \
b) when I load auctex-mode, I obtain this:
   Loading latex...
Loading regexp-opt...done
Loading cl-macs...done
Loading advice...done
Loading edmacro...done
Loading easy-mmode...done
Loading latex...done
call-interactively: Autoloading failed to define function auctex-mode