code: public function render(Mage_Core_Block_Abstract $block, $blockContent, $id) {
  
          $helper = Mage::helper('aoe_templatehints/blockInfo'); /* @var $helper Aoe_TemplateHints_Helper_BlockInfo */
  
          $path = $helper->getBlockPath($block);
          $blockInfo = $helper->getBlockInfo($block);
  
          $wrappedHtml = sprintf(
              "\n".
              '<!-- [START: %1$s] %4$s'."\n".'%5$s -->'.
              "\n".
              '%3$s'.
              "\n".
              '<!-- [END: %1$s] %4$s -->'.
              "\n",
              $id,
              $blockInfo['cache-status'],
              $blockContent,
              $helper->renderTitle($blockInfo),
              $this->renderBox($blockInfo, $path)
          );
  
          return $wrappedHtml;
      }
docs: Render template hint
  
  @param Mage_Core_Block_Abstract $block
  @param $blockContent
  @param $id
  @return string|void