I want to learn more about this, but (ironically), when I go to the "I don't get it" section and click on link " Will and Abe come to the rescue, with their Gui

I want to learn more about this, but (ironically), when I go to the "I don't get it" section and click on link " Will and Abe come to the rescue, with their Guide to Pyjs"... it comes up 404. And clicking on the FAQ link doesn't help someone get it either... I guess I still don't get it?