int FindWindow_l(lua_State *L)
{
    int i_count = lua_gettop(L);
    if (i_count >= 1)
    {
        LPCSTR lpWindowName = (LPCSTR)lua_tostring(L, 1);
        LPCSTR lpClassName = 0;
        if (i_count == 2) lpClassName = (LPCSTR)lua_tostring(L, 2);

        HWND Window = FindWindowA(lpClassName, lpWindowName);
        lua_pushnumber(L, (int)Window);
    }
    return 1;
}