> Hello, I am looking for way how to mirror a password
> secured website which additional requests the input
> of a four digit access code which is shown on login
> page as graphic. After login via browser and copying
> a url of the website into a new browser window, no
> password is requested again. Copying the same url to
> HTTrack results in the login page with this
> additional access key request. Any ideas?
After log in your browser has the needed cookies.  After copying the url to
another window the browser sends the needed cookies - everything works.

You need to get the cookies to HTTrack.  Pasting the url wont do it.

You need to use the Add URL... -> Capture URL... method