On 10 May 2003 at 9:51, Nick Peaden wrote: > Thank you, maybe I should have specified C, but I have made a for routine to > do a fairly fast lookup. Seeing "assembly" in mailing lista address automatically kicks me into ASM mode :) Have you considered binary search? http://www.dcc.uchile.cl/~rbaeza/handbook/algs/3/321.srch.c Jorma