If you encounter this pattern today, treat it with respect—it has likely served a website reliably for over two decades. But also plan a migration path to modern, secure, and SEO-friendly technologies.
HTML files. These files allow a web server to insert dynamic content (like a common header or footer) into a webpage before sending it to the browser. view indexframe shtml link
If the link is part of a hardware management interface (like a router), clicking it will usually prompt you for a username and password. If you encounter this pattern today, treat it