Ah no, that is not 100% right Anke. If the User leaves one screen for another, the timer should be
disabled first, else it can have a detrimental effect on other Screens (even cause a crash). However, if the App is not showing on screen (screen sleep or home button selection) and the timer is not disabled, it will continue to fire (which could be good, could be bad, with respect to the home button).
"Timer Always Fires" is repetitive - whatever you put in the Timer Event Block will be repeated every x milliseconds ("Timer Interval"), but it does not start until "Timer Enabled" is true.