An event is something that happens when a link or button is clicked in a portlet. A portlet's events are specified in the provider.xml file. For information about setting up a portlet event handler for your portlets, see the Portal Developer Kit on Oracle Technology Network. In your pages, you can specify what to do when an event occurs on any of the portlets on that page.
When an event occurs, you can:
Go to another page, optionally passing values to that page's parameters.
Redisplay the current page.