The status icon displays the current system status of SmartCallMonitor. Additionally it provides access to the main controls of SmartCallMonitor. You can find the status icon in the lower right corner in the system tray.
It's color informs you about the current status of SmartCallMonitor:
Green means "Active",
red means "Stopped".
The status icon will vanish from your system tray if you exit SmartCallMonitor completely.