Xtivity gives you root level control over your project by generating triggers that make the actions in the project start. A trigger is basically an event that occurs in the project such as when a user clicks or moves their mouse over an item Other events such as when an item is shown, moved, resized or changed in some way can also activate triggers.
A single event trigger can be setup to activate an unlimited number of actions that are applied throughout your objects in your project. A single click on a button for example, can start a video, move text onto the scene, play audio, fade out old images and bring in new ones.