Thanks Ross, I've just downloaded the paper and look forward to reading it |----> Peter Sommer ------------------------------------------->| |----> hcorn@cix.co.uk P.M.Sommer@lse.ac.uk ------------------>| |----> Academic URL: http://csrc.lse.ac.uk/csrc/pmscv.htm ----->| |----> Commercial URL: http://www.virtualcity.co.uk ----------->|