>lets skip the authentication
>and start already at the branch deep within the 
>site. But then I would need a possibility to tell 
>HTTrack the correct HTTP_REFERER for this deep 
>down entry point. But there is no option to tell 
>HTTrack which HTTP_REFERER to use for its first URL. 

Right, you can't yet set the first referer, but this 
would be useless as you won't get any page, because 
the authentication has to be done for each pages!