The Simple Failover user interface (sfogui.exe) is represented by an icon in the system tray of your Windows desktop area.
This provides several useful features as follows:
Double-clicking on the icon will open the main window.
You can access a pop-up menu by right-clicking on the icon:
From this menu, you can either open Simple Failover (opens the main window), Pause / Resume all server polling, or exit the Simple Failover UI (leaves the service running in the background).
When all polling is paused, this will be indicated by a red pause symbol flashing on the tray icon:
The tray icon can also show balloon tips to let you know that problems were detected - when enabled in the Options dialog / User interface section.