Siebel Business Process Framework: Task UI Guide > Task UI Concepts > Language Concepts for Task UI >
When a task is paused, resumed, canceled, or deleted, events are fired to handle these operations. The event handler for each operation performs the required actions according to the semantics of each operation.
NOTE: Event Handlers cannot be associated with subtasks. If a task event is triggered when the user is in a subtask, the corresponding event handler associated with the main task is executed. The event handler is executed in the context of the main task.