Listing/Enumerating global variables ?

["Lionel Fumery" <lif-ml@...>]

Hello,

I use the following code to create global variables :
   lua_pushnumber(m_LUA, Value);
   lua_setglobal(m_LUA, VarName);

Is there a way to find / list / enumerate all those global variables, 
without knowing their name ?

Thank you for your help,

LiF.