Detect from browser if specific application is installed

Question

We have an advanced webpage (ASP.NET, C#), and a application which needs to be installed on the client computer in order to utilize the webpage to its fullest. The applicati

Answer 1

Well the method that was mentioned by "some" is very common but there's also other methods for example if the application is listening locally on a port it can be detected from the browser which is very common for security solutions because have some sort of local proxy to filter the traffic. I actually made a video a while ago about using this technique to detect avast anti-virus you can watch it here:

https://www.youtube.com/watch?v=39_Nd8oiEAk