> How does Jon know that the dollar Jon received from Mike is a dollar? > > A dollar has specifications that tell you it's a dollar (type of paper, ink, micro printing, etc) I don't think the dollar analogy is all that useful. A dollar is backed up by people with guns, who hunt down and punish counterfeiters, which means that ordinary people don't have to know how to validate a dollar bill, because the incidence of forgery is low. /==============================================================\ |John Stracke |Principal Engineer | |jstracke@incentivesystems.com |Incentive Systems, Inc. | |http://www.incentivesystems.com |My opinions are my own. | |==============================================================| |"HTTP is what happens in the absence of good design." -- Keith| |Moore | \==============================================================/