well, the only thing I know is a reverse address res protocol only problem is that if not on the same subnet/network then it'll just get lost. It will find it if its within the same network, though. However, you will have a very hard time finding it. Good luck! (look up RARP)
If you argue with an idiot he will drag you down to his level and beat you with experience.
I am not a fast writer.
I am not a slow writer.
I am a half-fast writer.