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>Im very new to this, and I would like to know (with some minimal example if 
>posible), how to execute a lua script from my C++ app and make it modify 

Execute a script with lua_dofile. Read and write variables with lua_getglobal
and lua_setglobal.

Here is a simple example:

-- script hi.lua


-- C code

	lua_dofile(L,"hi.lua");		/* outputs "nil" */
	lua_pushstring(L,"John Lennon");
	lua_dofile(L,"hi.lua");		/* outputs "John Lennon" */

Hope it helps you get started.