> Is it possible to install httrack on a usb flash drive 
and 
> run it from the flash drive? This would mean the flash 
> drive must have room to store the pages downloaded from a 
> mirror.

See a previous thread (please use the search engine before 
posting!)

To be fast: yes, this is possible, just download the -
noinst ZIP file in the main httrack site, and unpack all 
files on the flash key.