It's odd to hit the x to close and the program actually just minimizing. Odder still was that when I hit minimize, by default, it minimized to a separate icon to the main application. I changed to it minimizing into the dock icon. But the inconsistent behavior of the x button means sometimes it and the _ button (I can't call these close and minimize on this system because that's not what they are anymore) have similar, if not identical, functionality.