One nice side effect of handling the "Instance close" event is that it provides a nice way to close certain types of aplications which are otherwise awkward. For instance, if you are working with a VI that has no title bar (for an embedded or kiosk UI application, for instance), but it also has no exit button or other UI control for exiting, how can you gracefully shut it down while working with it in development? There are any number of ways, but handling the "instance close" event provides a convenient way. Assuming you are using a project, you can close your VI by clicking on the LV project viewer's title bar close button (the "'X' in the upper right-hand corner) and it will close your VI, but not LV or the project viewer. Of course, if you build your VI into an executable, if you use the windows task manager "applications" tab to kill the VI, it will be handled "gracefully" as well.