What is a Permalink, or better yet, why use permalinks?
When new posts are placed at the top of the forum list, it causes older posts to move down the screen and eventually off of the page. Whither have they gone? The old posts still exist in a database that can be accessed using their permanent link address, a.k.a. permalink. The reason to use permalinks is so that you can link to a post using a web address that won’t change with time. Clicking permalink (or “link to this page”) at the bottom of a post will display the page’s permalink in the address window, which can then be copied and used for reference in some other document, say to email a friend.
Trackback is another address for a site which can be pasted into a ping engine, to let the other site know you linked to them, e.g., “Hi, I linked to your page!” Trackbacks are an example of a great idea which has been ruined by inconsiderate “businesses” that use internet spam. The sheer volume of pings related to spam has caused trackbacks to become a drag on the internet. Spammers are basically pissing in the well of civilization so they can make a couple bucks.