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What is Action support and Action pollar in V.F?

What is Action support and Action pollar in V.F?

Best Answer chosen by Admin (Salesforce Developers) 
Sujan Kumar ReddySujan Kumar Reddy
Hi Anvesh,

These are Part of AJAX Components, the scope of these components are

Action Support:
A component that adds AJAX support to another component, allowing the component to be refreshed asynchronously by the server when a particular event occurs, such as a button click or mouseover.

Action Pollar:
A timer that sends an AJAX update request to the server according to a time interval that you specify. The update request can then result in a full or partial page update. You should avoid using this component with enhanced lists.

For detailed info, you can refer this PDF http://www.salesforce.com/us/developer/docs/ajax/apex_ajax.pdf