Just like any other page, if you want to prevent everyone from accessing a page you're not using, then simply delete or rename the corresponding (ie: /includes/modules/pages/product_reviews_write/ ) folder and then any visitor or search engine who tries to visit the page (ie: index.php?main_page=product_reviews_write ) will get a nice ugly 404 NOT FOUND response (or whatever you've configured your site to deliver).
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