This might be dumb question, but how does the user terminate application form application’s view ?

Skiming through slides from conference there were slide with this :

Application is terminated when
• The Tizen::App::Terminate() method is called
• Another application requests termination by calling the Tizen::App::AppManager::TerminateApplication()method
• The application is in the foreground and the user presses the END key
• The user selects “End” in the task switcher
• The number of concurrent Tizen applications exceeds the limitation defined by the system policy
• The system memory or power is extremely low

but where is misterious END key ? On developer device is only one button – middle one, and if you press it then app goes to background… And I wonder is it me implementing something wrong in my app or is it normal behavior ?