Third Edition (September 1996)This major revision supersedes SY33-0185-01. Technical changes are shown by a vertical line to the left of each change.The following paragraph does not apply to any country where such provisions are inconsistent with local law:THIS PUBLICATION IS PRINTED “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING,BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.Some states do not allow disclaimer of express or implied warranties in certain transactions; therefore, this statement may not applyto you.This publication could contain technical inaccuracies or typographical errors. Changes are periodically made to the informationherein; these changes will be incorporated in new editions of the publication.It is possible that this publication may contain reference to, or information about, products (machines and programs), programming,or services that are not announced in your country. Such references or information must not be construed to mean that suchproducts, programming, or services will be offered in your country. Any reference to a licensed program in this publication is notintended to state or imply that you can use only the licensed program indicated. You can use any functionally equivalent programinstead. Copyright International Business Machines Corporation 1995, 1996. All rights reserved.Note to U.S. Government Users — Documentation related to restricted rights — Use, duplication, or disclosure is subject torestrictions set forth in the GSA ADP Schedule Contract.