They are both called by AJAX calls arising from custom properties of custom JSF components. autoSubmitessentially asynchronous post-contact content specific to this component, for maintaining server-managed bean values with content inside the component on the client side.
A partialSubmitis another asynchronous AJAX call that will immediately return the component value for any component event, for example, lose focus on the inputText ICEFaces component.
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http://balusc.blogspot.com/2006/09/debug-jsf-lifecycle.html