Besides the papers and information acknowledged at the top of this article, the following people have contributed help, advice, suggestions and information: Earle Ake 513-429-6500 ake@Dayton.SAIC.COM chris@uuplus.com (Christopher J. Ambler) jhc@iscp.bellcore.com (Jonathan Clark) jorge@laser.satlink.net (Jorge Cwik) celit!billd@UCSD.EDU (Bill Davidson) "Drew Derbyshire" ahd@kew.com erik@pdnfido.fidonet.org Matthew Farwell dylan@ibmpcug.co.uk dgilbert@gamiga.guelphnet.dweomer.org (David Gilbert) kherron@ms.uky.edu (Kenneth Herron) Mike Ipatow fido.itc.e-burg.su> Romain Kang romain@pyramid.com "Jonathan I. Kamens" jik@GZA.COM "David J. MacKenzie" djm@eng.umd.edu jum@helios.de (Jens-Uwe Mager) peter@xpoint.ruessel.sub.org (Peter Mandrella) david nugent david@csource.oz.au Stephen.Page@prg.oxford.ac.uk joey@tessi.UUCP (Joey Pruett) James Revell revell@uunet.uu.net Larry Rosenman ler@lerami.lerctr.org Rich Salz rsalz@bbn.com evesg@etlrips.etl.go.jp (Gjoen Stein) kls@ditka.Chicago.COM (Karl Swartz) Dima Volodin dvv@hq.demos.su John.Woods@proteon.com (John Woods) jon@console.ais.org (Jon Zeeff) Eric Ziegast ziegast@uunet.uu.net