When the program starts, a icon appears in the system tray. Right click -> Settings to modify almost every aspects of SmartFlip. The default trigger is the F9 key, but you can choose even to replace Flip3D (Win-TAB keys)

If you want to see only the windows created by the current application (ex: only Word windows), the default key is F10. But you can change it, of course. You can achieve this when you replaced Flip3D by pressing SHIFT. Voice control is currently not implemented. Screen amount is not implemented completlly, too.