> 1) I would want to be able to feed HTTrack a list of
> probe
>    URLs in a text file, one per line. Each could be
> a single

If the list is on line, httrack <http://...list.htm> -Y

Gui version, try help on the URL page, options:
"Download all site in pages"
"Test links in pages"
It says you can drag and drop your bookmark file.

> 2) The site doesn't generate a 404 error on an

options -> Build -> No error pages = checked
findstr /m "external.html" | findstr /F:/ "mirror"