Oops, pressed tab and space to indent for a new paragraph 
and it submitted it :(

  Anyway, I think this would be good for filtering out 
unwanted webpages. Say you wanted Httrack to copy 
Www.blender.org, but you only wanted it to copy the pages 
that contain the word blender. HTTrack would go to the 
page, download it, search for the word blender, if it wasnt 
there, it would delete the page and not come back, nor 
would it download any files from that page or follow any 
links from that page.