EFServiceManager implements this interface to handle progress bar updates that are received from the implementation of IEFCustomPublish. The software that implements IEFCustomPublish declares an object of IEFCustomPublishEventHandler. This object is set in EFServiceManager by passing itself as the parameter to SetEventHandlerObj() and update the publish progress bar with the required steps. The software implementation of IEFCustomPublish must call StepProgressBegin() and StepProgressEnd() when required to update the publish progress bar.