Documentation
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Portlet Coordination
Set this property to specify how events are distributed. If the value is layout-set, then events will be distributed to all portlets contained in a layout set. If the value is layout, then events will be distributed to all portlets that are present in a layout.
portlet.event.distribution=layout
Set this property to specify how public render parameters are distributed. If the value is layout-set, then public render parameters will be distributed to all portlets contained in a layout set. This will only work correctly if the property layout.default.p_l_reset is set to false. If the value is layout, then public render parameters will be distributed to all portlets that are present in a layout.
portlet.public.render.parameter.distribution=layout