When you watch a movie, play games, or make a presentation, you run the application in the full-screen mode. Norton Internet Security detects the application that you run in the full-screen mode and automatically enables Silent Mode. When Silent Mode is enabled, Norton Internet Security suppresses most of the alerts and suspends background activities. Only those activities run that are involved in protecting your computer from viruses and other security threats. Minimum background activities also ensure high performance of your computer. The activities that are suspended run after you finish using the application in the full-screen mode.

Silent Mode also helps you maintain an uninterrupted Media Center Extender session. A Media Center Extender session is an extended session of Media Center to an entertainment device, such as a television. The alerts and notifications that appear during a Media Center Extender session disconnect the session between the host computer and the entertainment device. Norton Internet Security identifies a Media Center Extender session as an active full-screen application and turns on Silent Mode. When Silent Mode is enabled, Norton Internet Security suppresses alerts and notifications and suspends background activities to provide an uninterrupted Media Center Extender session.