Timer is used as a timer of a card which starts at the card active and stops at the execution of a task inside the card. The timer will decrement from its initial value to 0. An ontimer intrinsic event is activated when the timer is conuted from integer value 1 to 0.
The wml:Timer element declares a card timer, which provides a method for invoking a task automatically after some period of user inactivity. Any task or user action that activates the card starts the timer, and executing any task element stops it. You can only associate one task for each timer, and you can only define one timer for each card.