It's called auto-termination: http://developer.apple.com/library/mac/#documentation/General/Conceptual/MOSXAppProgrammingGuide/CoreAppDesign/CoreAppDesign.html

It's called auto-termination: http://developer.apple.com/library/mac/#documentation/General/Conceptual/MOSXAppProgrammingGuide/CoreAppDesign/CoreAppDesign.html#//apple_ref/doc/uid/TP40010543-CH3-SW27 http://developer.apple.com/library/mac/#documentation/Genera... Only applications that support auto-save AND set NSSupportsAutomaticTermination to YES do quit when there are no open windows.