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Scripts are comprised of several parts that work together to form a narrative.  Frames are contained within the script and they hold the script content. One or more Frames holds the  Resources, Events, Conditions, and Variables that are all parts of a script.

About Events

Events occur throughout a scenario (some automatically, some authored) and can be used to track progress and control scenario flow. Events are automatically emitted by resources (like, "an action is complete") or events can be created by the author (these are called custom events). Authors can use these events to dictate what happens when. For instance, you can create a sequence that says "When this avatar finishes talking, start the next part of the script". 

When viewing a script, you will see the events shortcut link (or blue + symbol) at the bottom of the main pane.  When you click on this, you will see the events that you can create:

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