The event handler (and filter) configurations used at runtime are those from the component with the highest precedence that specifies the event handler in question (for the purpose of merging the event handler is the identifier). Event classes that are to be processed by each handler as specified in the handler configuration in all the components are amalgamated into a merged configuration. It is also possible for higher precedence components to disable handler specified by lower precedence components by setting the removed attribute of the event-registration element to true.