Although these look like hand created pages, they're not. OK I'll tell you. I created a form that anyone with the right password can use to create and update their own classes on-line. This is cool since I don't need to deal with people's changing schedules. I'm sure just about everyone has used a search engine at some time.
Most browsers have a button to go to a customized version of one of the main search engines.
BUT both types need to be told where to start looking for new WEB sites. Then some person gets my data, checks out my site, to make sures it's legit, and then adds me into their big database. So it starts from the top, and begins reading every line in my page. As it goes along, if it sees any hot-links, it takes a note of them. This is like a one-stop shopping experience.