We have a large web application that runs in any modern browser. For specific functionality (which cannot be done in a browser), it would be useful to have a native Windows application complementing it. It should be possible to initiate a communication from either side. (From Windows side, of course only if the web app is open. Possible that the web app bootstraps the communication when starting.)

I am looking at the Intel Driver Support assistant. https://www.intel.de/content/www/de/de/support/intel-driver-support-assistant.html
I had to install a native Windows app. Now the communication between the web app in FF (or any other browser I use) and the native app runs smoothly without any confirmation popups, etc.

Can somebody explain how this is achieved? Or of course any other advice. Many thanks!