code: public function viewHandleAction()
      {
          $area = $this->getRequest()->getParam('area');
          $storeId = (int)$this->getRequest()->getParam('store');
          $handle = $this->getRequest()->getParam('handle');
  
          $updatesByFile = $this->getService()->getFileUpdatesWithHandle($handle, $storeId, $area);
          $databaseUpdates = $this->getService()->getDatabaseUpdatesWithHandle($handle, $storeId, $area);
  
          $block = $this->getLayout()->createBlock('sheep_debug/view', '', array(
              'template' => 'sheep_debug/view/panel/_layout_updates.phtml',
              'file_updates' => $updatesByFile,
              'db_updates' => $databaseUpdates
          ));
  
          $this->getResponse()->setBody($block->toHtml());
      }
docs: View layout handle details