Resource about configuring Apache to require password for accessing a specific location can be found here: http://www.freebsdonline.com/content/view/39/54/

To activate listing of files from your browser when accessing a specific directory from an Apache server,

within your <Directory> tag for that specific path, add this:

This will enable file listing for that directory.

If you have this enabled and you want to disable it change "Options" line with:

For example if you want Apache to ignore .htaccess file within a directory, between <Directory> tags for that specific directory you will need the following line: