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I'm not sure what you mean either.
This may be a stupid question, but can't you pass a parameter? It behaves
like a local variable.

function f(a, b, c)
	print(a, b, c)

lua_pushnumber(L, 1);
lua_pushnumber(L, 2);
lua_pushnumber(L, 3);
lua_call(L, 3, 0);

-- Danilo

> >I'm calling a Lua function from C, and wish to set up some local 
> >variables for that function, pre-calling it.
> I'm not sure what you mean here, but you can try using 
> upvalues instead.
> Consider this example
>  do
>    local a=10
>    local b=20
>    local c=30
>    function f()
>     print(a,b,c)
>    end
>  end
> Then in C you can call lua_setupvalue on f to set a,b,c (or 
> any one of them individually). After that, call f. Try this:
>  lua_getglobal(L,"f");
>  lua_pushnumber(L,2004);
>  lua_setupvalue(L,1,2);
>  lua_call(L,0,0);
> --lhf