> is HTTRACK in command line version use errorlevel to
> detect if tranfert failed or OK ?
Err nope - actually it might be usesul for single files, 
but generally (when mirroring a complete site), "success" 
or "failure" status are not very easy to establish (even 
with tons of 404's, the site is potentially okay ; but a 
single 404 can also cause the website to fail)

The only solution would be to post-check the file transfer 
status (hts-cache/new.txt) and check the number of 2xx/3xx 
codes (OK)