How to identify the component in an action

Hi, here is my scenario:
I have multiple tree components in a page and all nodes of them are associated with an action. And I need to identify the id of the tree, from where the action is triggered. But it seems that I cannot pass any parameters into the action. Is there anything like event to let me dynamically identify the tree id where the node clicked belongs to? Using ActionListener?
thanks,

Please see
http://developers.sun.com/prodtech/javatools/jscreator/reference/techart/2/tree_component.html
Note this sample does not work for portlet.

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How to identify the component in an action

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