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BDE: <apex:commandLink>, <apex:commandButton>, <apex:form>.
<apex:actionSupport> isn't needed for <apex:commandLink> nor <apex:commandButton> in order to perform partial page updates.
The simplest way to implement a partial page update is to use the reRender attribute on an <apex:commandLink> or <apex:commandButton> tag to identify a component that should be refreshed. When a user clicks the button or link, only the identified component and all of its child components are refreshed.
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_quick_start_ajax_partial_page_updates.htm
An <apex:commandLink> component must always be a child of an <apex:form> component.
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_commandLink.htm
An <apex:commandButton> component must always be a child of an <apex:form> component.
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_commandButton.htm
The simplest way to implement a partial page update is to use the reRender attribute on an <apex:commandLink> or <apex:commandButton> tag to identify a component that should be refreshed. When a user clicks the button or link, only the identified component and all of its child components are refreshed.
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