[NTG-context] Lua in LuaLaTeX is diferent??

Hi, I did a Lua application for ConTeXt, and now I wanted to adapt it to work even LuaLaTeX. On what needs to be careful? Compiling by LuaLaTeX specific messages appear as if the Lua in LuaLaTeX didnt know some Lua commands (i.e. split, find .... ). On what needs to be careful generaly when programming applications for LuaLaTeX? Thanx Jaroslav