Hello Brian,

I found your post in search of answering a similar question(s) to yours. I am
going to attempt to answer your questions as best as I can, seeing as how I am
also new to this application.

1. You can use either HTTrack or your browser to navigate the local copy of
the website on your hard-drive.
  
Using HTTrack: Click "File" then Select "Browse Sites..", which will open up
your browser and display the index.html of the mirrored site that is located
on your hard-drive.

Using Browser/Windows: You can do this two ways. You can navigate to where the
mirrored site is located on your hard-drive and open up the index.html file or
you can open your browser and then open up the index.html through it (this
takes longer).

2. This question is related to what I was originally trying figure out.
HTTrack does not need to build an index of the directory/file structure
because I believe it uses relative paths in the html files to locate where
everything is. For example, say I have an index.html file located in "C:\My
Web Sites\Example Website\index.html". If you specified your "Project name",
at the time you downloaded the site, to be "Example Website" then there should
be an index.html and whtt file located in the "C:\My Web Sites" folder and
another index.html located in the "C:\My Web Sites\Example
Website\index.html". The first one is what is opened when you Select "Browse
Sites.." under the File menu. The index.html file located in "C:\My Web Sites"
folder will have an entry that looks like this "Example Website/index.html".
So as you can see HTTrack does not care about the full path (aka the absolute
path of "C:\My Web Sites\Example Website\") it only cares about the folder
where the content resides (e.g. "Example Website/index.html").

3. Locate the whtt file of the site in question, open it up through HTTrack
(Select "File" then Select "Open..." and locate the whtt file), and you should
be presented with a window showing you the "Action:" to take and the "Web
Addressess: (URL)" of the site. You can use "Update Existing Download" under
the "Action:" list to do what you ask.

4. Good question. I do not know the answer to this. I tried using HTTrack to
mirror a local copy of a website that I had already downloaded by specifying a
path to a folder on my hard-dive instead of a URL. The idea was to test and
see that if I deleted a file that HTTrack would either keep it or remove the
folder on my hard-drive. But it didn't work properly. Not sure what the
behavior of this is.