Opening para from a NYT article on the Waldorf School in Silicon Valley:
"The chief technology officer of eBay sends his children to a nine-classroom school here. So do employees of Silicon Valley giants like Google, Apple, Yahoo and Hewlett-Packard.
But the school’s chief teaching tools are anything but high-tech: pens and paper, knitting needles and, occasionally, mud. Not a computer to be found. No screens at all. They are not allowed in the classroom, and the school even frowns on their use at home."
Signal desktop is designed to be a stand alone app that uses the phone phone to first verify the connection via QR but after that relays messages, calls, erc direct from and to the server, inrependently of the phone app.