> how can i download more than one website in one
> output-directory and build an index over these sites? 
When i
> use httrack for the second site, the first one gets
> overwriting (with a warning),
> 
> Ex.:
> httrack -O websites <http://www.site1.com>
> and in a second run:
> httrack -o websites <http://www.site2.com>
> 
> The second run deletes everything in the websites-
directory,

httrack --continue -o websites <http://www.site1.com> 
<http://www.site2.com>