What are the limitations of using framed pages in terms of bookmarking, search engine indexing, and user interaction?

Using framed pages can cause issues with bookmarking, as the URL in the browser does not change when navigating within frames. This can also affect search engine indexing, as search engines may not be able to properly index the content within frames. Additionally, framed pages can limit user interaction, as users may not be able to easily share or link to specific pages within the frameset.

<?php
header("X-Frame-Options: DENY");
?>