> pdfTex will take TeX input and output PDF Ok, well, maybe I don't understand TeX at all, because I thought that's exactly what it did. EDIT: Ahh, wait, I ha

> pdfTex will take TeX input and output PDF Ok, well, maybe I don't understand TeX at all, because I thought that's exactly what it did. EDIT: Ahh, wait, I have it! When they say "extension" they mean "implementation"! They actually replace TeX as an engine. Is that right? So, luaTex is just an implementation of TeX written in Lua?