In a post to the Ultima Dragons Facebook Chapter, Dee DæGraaffe explained her (I assume?) latest bit of handiwork:

For anyone else that uses the Yubnub.org search engine: I just created the command “ultima” to search the Codex of Ultima Wisdom hosted by Ultima Aiera.

So here, basically, is how it works. You go to YubNub.org, and…well, let’s say you want to search for information about Ultima 6. Because really, it’s Ultima 6; you should want to know everything there is to know about that game.

Anyhow, in the text input field at YubNub, you type: ultima ultima 6

That will take you to the corresponding search result at the Codex: the Ultima 6 page.

Simple as anything, right?