> > How do you propose the HTT find the new files
> > WITHOUT asking the server?
There is no magic here. If it doesn't ask the server NOTHING IS CHANGING -- NO
NEW FILES

Asked and answered 3 times: NO!

> >> Is there a way of specifying during the update 
> >> not to fetch, or not to save html files
> previously fetched? 

If the file is not changed there is no fetch. Asked and answered

> I would be really grateful if someone could confirm
> the _no_   as the answer to : 

N   N    OO   !
NN  N   O  O  !
N N N   O  O  !
N  NN    OO   *



> Is there functionality in httrack not to save the
> html files if they were previously saved?
There is NO fetch, there is nothing to save - unless the file has changed.