> I'm already controlling this from VB using the command 
line 
> shell. The command options I am using are :
>  -%c10 -x -o0 -Z -I0 -%I0 -p1 -l -N0 
> This still prompts for whether I want to update the cache 
> in a DOS window, where the cache file exists.
> Any further thoughts?
Tell httrack not to bother your --

httrack --quiet -%c10 -x -o0 -Z -I0 -%I0 -p1 -l -N0 ..