how does ballon-help work under X?

I've been knocking up some C support for balloon help under mswindows and have suddenly realised that I can find no place where the code in balloon-x.c is called. Can anyone enlighten me? Or is this just dead code that never got finished? I can't find any reference to it from Kyle's balloon-help.el or any other lisp file. What am I missing? andy --------------------------------------------------------------------------- " .sigs are like your face - rarely seen by you and uglier than you think" Dr Andy Piper, Technical Architect, Parallax Solutions Ltd mail: andyp(a)parallax.co.uk web: www.parallax.co.uk/~andyp