> If the header 'Connection: close' is NOT sent, does this
> mean keepalive will be used by HTTrack?  Or is there an

No, the server has to tell that it supports keep-alive.
Many servers can't handle that, when dealing with CGI.

If keepalive is used, you should see some statistics at the 
end of the hts-log.txt file (like "with average of 5.34 
requests per connection")