Micro Focus Mainframe Express®

Host Compatibility Option Technical Guide

Micro Focus®

Issue 6b
October 2000

Copyright © 2001 Micro Focus International Limited.
All rights reserved.

Micro Focus International Limited has made every effort to ensure that this book is correct and accurate, but reserves the right to make changes without notice at its sole discretion at any time. The software described in this document is supplied under a license and may be used or copied only in accordance with the terms of such license, and in particular any warranty of fitness of Micro Focus software products for any particular purpose is expressly excluded and in no event will Micro Focus be liable for any consequential loss.

Animator®, COBOL Workbench®, EnterpriseLink®, Mainframe Express®, Micro Focus®, Net Express®, REQL® and Revolve® are registered trademarks, and AAI™, Analyzer™, Application to Application Interface™, AddPack™, AppTrack™, AssetMiner™, CCI™, DataConnect™, Dialog System™, EuroSmart™, FixPack™, LEVEL II COBOL™, License Management Facility™, License Server™, Mainframe Access™, Mainframe Manager™, Micro Focus COBOL™, Object COBOL™, OpenESQL™, Personal COBOL™, Professional COBOL™, Server Express™, SmartFind™, SmartFind Plus™, SmartFix™, SourceConnect™, Toolbox™, VS COBOL™, WebSync™, and Xilerator™ are trademarks of Micro Focus International Limited. All other trademarks are the property of their respective owners.

No part of this publication, with the exception of the software product user documentation contained on a CD-ROM, may be copied, photocopied, reproduced, transmitted, transcribed, or reduced to any electronic medium or machine-readable form without prior written consent of Micro Focus International Limited.

Licensees may duplicate the software product user documentation contained on a CD-ROM, but only to the extent necessary to support the users authorized access to the software under the license agreement. Any reproduction of the documentation, regardless of whether the documentation is reproduced in whole or in part, must be accompanied by this copyright statement in its entirety, without modification.

U.S. GOVERNMENT RESTRICTED RIGHTS. It is acknowledged that the Software and the Documentation were developed at private expense, that no part is in the public domain, and that the Software and Documentation are Commercial Computer Software provided with RESTRICTED RIGHTS under Federal Acquisition Regulations and agency supplements to them. Use, duplication or disclosure by the U.S. Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of The Rights in Technical Data and Computer Software clause at DFAR 252.227-7013 et. seq. or subparagraphs (c)(1) and (2) of the Commercial Computer Software Restricted Rights at FAR 52.227-19, as applicable. Contractor is Micro Focus International Limited, 9420 Key West Avenue, Rockville, Maryland 20850. Rights are reserved under copyright laws of the United States with respect to unpublished portions of the Software.


This book describes the functionality provided by Mainframe Express Host Compatibility Option running under Windows 2000, Windows NT, Windows ME, Windows 98 or Windows 95.


This manual is intended for you, if you need to develop DB2 for OS/390 applications using personal computers or workstations. It is also intended for current users of DB2 Universal Database, DB2/NT or DB2/WIN95. It is assumed that you have a general understanding of the COBOL language, and in particular of DB2 for OS/390, and that you have access to the related publications described below.

Related Publications

Notations and Conventions

Enter refers to the carriage return or Enter key. Where commands to be typed are shown, the Enter key is not explicitly shown; it is treated as implicit that Enter must be pressed at the end of the line.

Hexadecimal numbers are enclosed in quotation marks and preceded by a lower-case "x" or "h"; for example, x"9D", h"03FF". The "x" is used when the hexadecimal number represents a character string; the "h" when it represents a numerical value.

PIC X is used with the COMP-X and COMP-5 data types rather than PIC 99. Unlike PIC 99, PIC X shows the length of the data item and so demonstrates more clearly the use of COMP-X, which is to define a binary item of the specified number of bytes.

Keytops and menu choices are emboldened within the text.

Side headings are used to indicate environment specific information. For example:

DB2 Universal Database
DB2 Universal Database information. HCO can be used with DB2 Universal Database, DB2/NT V2.1, and DB2/WIN95 V2.1. This manual refers to the current version of the product except where noted.