This application simply reads the given directory and its subdirectories, and produces an HTML file based on a given template. The result file can be used to print out the contents of the folder, or as a sitemap of your website.
Note that his program can't read your website online. This means that it doesn't understand external URLs, it only reads and exports a folder.
In short, there are two ways you can use this program: creating sitemaps (for websites) and simply getting a contents of a folder.