The MessageBox action is used mostly for testing simple logic in your application or game and makes it easier to debug the initial setup once you hit the play button. When the MessageBox action is triggered it pops up a message box that has a title and your text inside it. ie: MessageBox can be used on your player to test if collision is working. When an enemy shoots your player you can have it trigger the message box to pop up "Ouch! I got shot! :( " Once you know that the collision is working correctly you can continue intergating the other mechanics. CAUTION: If you trigger the MessageBox action a lot of times at once.. you will have a lot of boxes to close.