Thanks for posting all answers.
As far as I understand: TeX is for the document part, Lua is for the thinking and computing (it's better in general programming than TeX). So if I want to create documents I need firstly know bit of TeX (plain or LaTeX) and later I can made some improvements by Lua. I will continue playing with it. If I have some good results or curious questions I will post it here. Ough: Wild bug appeared while I was playing: " I can't find file luatex.fmt. " How to build one? -- Mikoláš Štrajt
