The link on the web site documentation is bad http://luatex.org/documentation.html :

http://www.luatex.org/svn/trunk/manual/luatexref-t.pdf

Just installed miktex and it pointed to: "C:\miktex\doc\latex\oberdiek\luatex.pdf" dated: 2010/03/09 v0.4

Guess I should use pdftex commands for anything which I'm not finding?