URC7945, URC7966: What are Activities?

The Smart Streamer can control up to 3 Activities, called Watch TV, Play and Set Top Box (STB). Each Activity is a combination of up to 3 devices; your TV, a source device used for viewing content  (for example a Streaming Box) and an Audio Device such as a Sound Bar. Pressing the Activity key will power on each device in that Activity, power off unused devices from any other Activity and select the appropriate HDMI input on your TV.