When you close the iCamSource window, the iCamSource program still runs in the background. If the iCamSource window is hidden, there will be a small iCamSource icon in the Menu Bar (Mac) or System Tray (Windows). The icon is a small version of the iCam icon (camera lens). From this icon, you can stop, start, or quit iCamSource. If you select "Preferences" it will display the iCamSource window.