is activated. What is considered an activation 
	depends on the entity type.
</p>

<h4 id="use">
	Use | <code>USE</code>
</h4>

<p>
	Fired when the entity is activated, that is, receives a <i>Activate Once</i>
	message.
</p>

<h4 id="lockeduse">
	Locked Use | <code>LOCKED_USE</code>
</h4>

<p>
	Same as Use, but fired when entity activation fails due to the entity being
	locked.
</p>

<h4 id="open">
	Open | <code>OPEN</code>
</h4>

<p>
	Fired when the entity begins opening.
</p>

<h4 id="close">
	Close | <co