Dofile
From MaratisWiki
To every scene can be attached only one lua file. Use this command to use multiple files in your scene script. It can be used to include a common file that contains common functions or to include external third party libraries.
Example 1 : This script will add an external light effect library
dofile("lights/lightsfx.lua")
light = getObject("Light")
function onSceneUpdate() flickerLightEffects(light) end