Having built devices for generating random data, I can tell you the problem is more difficult than it appears. The problem is removing biases and correlations from the process. A good place to start is Murry, Herschell, "A General Approach for Generating natural Random Variables", IEEE Transactions on Computers, December 1970, p. 1210-1213. --------------------------------------------------------------------- John A. Thomas | (214) 263-4351 | jathomas@netcom.com Bowles & Thomas, L.L.P. | Voice | CompuServe 75236,3536 410 N.W Eleventh St. | (214) 262-6520 | Grand Prairie, Tx 75050 | Fax | PGP public key available ---------------------------------------------------------------------