3° image is a lie

Unfortunately the app does not work as it shows in the 3º image. Its a shame that they show something that the app does not do for real because its an expensive app.
It doesnt share the screen as a 2º display. It only open on porgram per time on your iPad screen, and it doesnt work if you minimize the window on your computer, so you need to keep the same window open, on the computer and on the iPad. And It just doesnt make sense!

Gustavo-meyer about iDisplay, v3.0.3