Remember that an application has to support the sudden termination API, and indicate to the OS that it can be safely shutdown, in order to actually have this co

Remember that an application has to support the sudden termination API, and indicate to the OS that it can be safely shutdown, in order to actually have this condition apply. http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSProcessInfo_Class/Reference/Reference.html#//apple_ref/doc/uid/20000316-SW3 http://developer.apple.com/library/mac/#documentation/Cocoa/... If you make no changes to your application, then the OS won't touch it. And if you do decide to support sudden termination, then hopefully you would call disableSuddenTermination before starting any background file transfers, renderings, etc.