TAD invoked from within a browser page
When you install TAD; it also install a customized protocol for the browsers on your machine. It will respond to special td: links inside the browser
In your installation, there is a special example of such an HTML file which has such formatted links. It is called tadprotocol.html You can drag and drop that file into your browser and explore the links in them. TAD will work magically based on which link you clicked.
Now open that file inside a text editor and see for yourself how that file was written. You can write your own HTML pages in a similar way; and if the computer where the browser displays your file has TAD; then the same magic can happen.
Press F1 inside the application to read context-sensitive help directly in the application itself