A knowledge base article about What is Duo Desktop? provided by the UC Berkeley IT Service Hub - Knowledge Portal
Berkeley IT is currently piloting Duo Desktop; it is only available to pilot users at this time.
Duo Desktop is a lightweight application installed on your computer that performs a “health check” when you try to access a protected application. It ensures your device meets security requirements without slowing your system or accessing your personal files.
If your computer passes the health check, Duo Desktop allows you to continue logging in. If the health check fails, you will not be able to log into the system until you fix the issue. Don’t worry, the Duo screen will provide steps on how to fix any issues.