Message directory

To use a message prefix to locate the document containing a specific message, see Table 1.

Table 1. Directory of messages
Prefix Component Title
ABA DFSMShsm z/OS MVS System Messages, Vol 1 (ABA-AOM)
ACP LANRES z/OS MVS System Messages, Vol 1 (ABA-AOM),
ADF Time Sharing Option Extensions (TSO/E) session manager z/OS TSO/E User's Guide,

z/OS TSO/E Command Reference

z/OS TSO/E Messages

ADM Graphical Data Display Manager GDDM Messages, SC33-0869
ADR DFDSS z/OS MVS System Messages, Vol 1 (ABA-AOM)
ADRY DFDSS z/OS MVS System Messages, Vol 1 (ABA-AOM)
ADY Dump analysis and elimination (DAE) z/OS MVS System Messages, Vol 1 (ABA-AOM)
AEM Graphical Data Display Manager GDDM Messages
AFB VSFORTRAN VSFORTRAN Version 2 Language and Library Reference, SC26-4221
AHL Generalized trace facility (GTF) z/OS MVS System Messages, Vol 1 (ABA-AOM)

z/OS MVS Dump Output Messages

AIR Predictive Failure Analysis z/OS MVS System Messages, Vol 1 (ABA-AOM)z/OS Problem Management
AIRH Predictive Failure Analysis z/OS MVS System Messages, Vol 1 (ABA-AOM)z/OS Problem Management
AMA SPZAP service aid z/OS MVS System Messages, Vol 1 (ABA-AOM)
AMB LIST service aid z/OS MVS System Messages, Vol 1 (ABA-AOM)
AMD Stand-alone dump z/OS MVS System Messages, Vol 1 (ABA-AOM)
AMS Availability manager z/OS MVS System Messages, Vol 1 (ABA-AOM) z/OS RMF Messages and Codes
ANT Remote Copy z/OS MVS System Messages, Vol 1 (ABA-AOM)
ANF Infoprint Server z/OS Infoprint Server Messages and Diagnosis
AOM Administrative operations manager z/OS MVS System Messages, Vol 1 (ABA-AOM)
AOP Infoprint Server z/OS Infoprint Server Messages and Diagnosis
API Infoprint Server z/OS Infoprint Server Messages and Diagnosis
APS Print services facility (PSF) Print Services Facility Messages, S544-3675
ARC DFSMShsm z/OS MVS System Messages, Vol 2 (ARC-ASA)
ARRP System Control Program (SCP) See message 52099 in Enterprise System/9000 Models 190, 210, 260, 320, 440, 480, 490, 570, and 610 Messages Part 2 for a complete message explanation and appropriate responses; see GA23-0378.
ASA MVS™ Reuse z/OS MVS System Messages, Vol 2 (ARC-ASA)
ASB Advanced Program-to-Program Communications/MVS (APPC/MVS) z/OS MVS System Messages, Vol 3 (ASB-BPX)z/OS MVS Dump Output Messages
ASD LANRES z/OS MVS System Messages, Vol 3 (ASB-BPX)
ASM Auxiliary storage manager (ASM) z/OS MVS Dump Output Messages
ASMA High Level Assembler for MVS & VM & VSE HLASM Programmer's Guide, SC26-4941
ASR Symptom record (SYMREC) z/OS MVS Dump Output Messages
ATB Advanced Program-to-Program Communications/MVS (APPC/MVS) z/OS MVS System Messages, Vol 3 (ASB-BPX)

z/OS MVS Dump Output Messages

ATR Resource recovery services (RRS) z/OS MVS System Messages, Vol 3 (ASB-BPX)

z/OS MVS Dump Output Messages

ATRH Resource recovery services (RRS) z/OS MVS System Messages, Vol 3 (ASB-BPX)
AVM Availability manager z/OS MVS System Messages, Vol 3 (ASB-BPX)
AXR System REXX z/OS MVS System Messages, Vol 3 (ASB-BPX)
BCD Batch Runtime z/OS MVS System Messages, Vol 3 (ASB-BPX)
BFS IBM® LAN server for MVS OS/390 MVS System Messages, Vol. 2, GC28-1785
BHI Basic HyperSwap® z/OS MVS System Messages, Vol 3 (ASB-BPX)

z/OS MVS Dump Output Messages

BLG Information System, Information Management The Information/Management Library Messages and Codes, SC34-4459
BLM Information System, Information Management The Information/Management Library Messages and Codes, SC34-4459
BLS Interactive problem control system (IPCS) z/OS MVS System Messages, Vol 3 (ASB-BPX)

z/OS MVS Dump Output Messages

BLX Information System, Information Management The Information/Management Library Messages and Codes, SC34-4459
BLW Loadwait/Restart z/OS MVS System Messages, Vol 3 (ASB-BPX)
BNH Network Problem Determination Application (NPDA) NPDA Messages, SC34-2115
BPX z/OS UNIX System Services z/OS MVS System Messages, Vol 3 (ASB-BPX),

z/OS MVS Dump Output Messages

CBDA Hardware configuration definition (HCD) z/OS and z/VM HCD Messages
CBR Object access method (OAM) z/OS MVS System Messages, Vol 4 (CBD-DMO)
CDS Open Cryptographic Service Facility (OCSF) z/OS Open Cryptographic Services Facility Application Programming
CEA Common Event Adapter z/OS MVS System Messages, Vol 4 (CBD-DMO)
CEE Language Environment® z/OS Language Environment Debugging Guide
CHS MVSSERV messages for the user and system programmer z/OS TSO/E Messages
CIM Managed System Infrastructure for Setup (msys for Setup) z/OS MVS System Messages, Vol 4 (CBD-DMO)
CMP Compression management services z/OS MVS System Messages, Vol 4 (CBD-DMO)
CLB C/C++ class library runtime messages z/OS MVS System Messages, Vol 4 (CBD-DMO)
CNL MVS message service (MMS) z/OS MVS System Messages, Vol 4 (CBD-DMO)

z/OS MVS Dump Output Messages

CNZ Console Services z/OS MVS System Messages, Vol 4 (CBD-DMO)
COF Virtual lookaside facility (VLF) z/OS MVS System Messages, Vol 4 (CBD-DMO)

z/OS MVS Dump Output Messages

z/OS TSO/E Messages,

CPO z/OS® MVS Capacity Provisioning z/OS MVS System Messages, Vol 4 (CBD-DMO)

z/OS MVS Capacity Provisioning User's Guide

CRG Context Services z/OS MVS System Messages, Vol 4 (CBD-DMO)
CRU Integrated catalog forward recovery utility (ICFRU) z/OS MVS System Messages, Vol 4 (CBD-DMO)
CSF Integrated Cryptographic Service Facility (ICSF) z/OS Cryptographic Services ICSF Messages
CSQ MQSeries® MQSeries for z/OS V2R1 Messages and Codes
CSR Callable services requests (CSR) z/OS MVS System Messages, Vol 4 (CBD-DMO)

z/OS MVS Dump Output Messages

CSV Contents supervision, virtual fetch, fetch z/OS MVS System Messages, Vol 4 (CBD-DMO)

z/OS MVS Dump Output Messages

CSY OPC/A Production Control System OPC/A Messages, SH19-6448
CSZ OPC/A Network Event Communicator OPC/A Messages, SH19-6448
CTX Context Services z/OS MVS System Messages, Vol 4 (CBD-DMO)
DFH Customer Information Control System/Virtual Storage (CICS®/VS) CICS/ESA Messages and Codes, SC33-0672
DFQ Interactive storage management facility (ISMF) Online only. To display the message explanation and suggested action, press the HELP key (PF1) twice when the message is currently displayed. Otherwise, go to ISPF option 7.2 Display Panel, enter the message ID in the message ID field, then press the HELP key (PF1) twice to show the message explanation. For more information, see the Using Help Panels for Error Messages topic in the z/OS DFSMS Using the Interactive Storage Management Facility
DGT Interactive storage management facility (ISMF) Online only. To display the message explanation and suggested action, press the HELP key (PF1) twice when the message is currently displayed. Otherwise, go to ISPF option 7.2 Display Panel, enter the message ID in the message ID field, then press the HELP key (PF1) twice to show the message explanation. For more information, see the Using Help Panels for Error Messages topic in the z/OS DFSMS Using the Interactive Storage Management Facility
DLX DLF installation exit COFXDLF2 These messages are issued by the sample DLF installation exit, COFXDLF2, whose source can be found in SYS1.SAMPLIB. Because the issuing module is a "sample", which can be modified by the customer, the messages are not described in an IBM document.
DMO Device Manager z/OS MVS System Messages, Vol 4 (CBD-DMO)

z/OS MVS Dump Output Messages

DQD Cache RMF Reporter (CRR) Cache RMF Reporter Program Description/Operations Manual, SH20-6295
DRK OPC/A Event Manager Subsystem OPC/A Messages, SH19-6448
DSI NetView® TME 10 NetView for OS/390 Messages, SC31-8237
DSM Document Composition Facility DCF: Messages, SH35-0048
DSM Document Library Facility DCF: Messages, SH35-0048
DSN Database 2 DB2 Universal Database for OS/390 Messages and Codes, GC26-9011
DZI Overlay Generation Language IBM Overlay Generation Language/370 User's Guide and Reference, S544-3702
DZJ Print Management Facility Print Management Facility User's Guide and Reference, SH35-0059
EDC C/C++ Run-time Library z/OS Language Environment Debugging Guide
EDG DFSMSrmm z/OS MVS System Messages, Vol 5 (EDG-GFS)
EDGH DFSMSrmm z/OS MVS System Messages, Vol 5 (EDG-GFS)
ELM IBM Communications Server — SNA z/OS Communications Server: SNA Messages
EQQ OPC/ESA OPC/ESA Messages and Codes, SH19-6719
ERB Resource Measurement Facility (RMF) z/OS MVS System Messages, Vol 5 (EDG-GFS)

z/OS RMF Messages and Codes

ERX Graphical Data Display Manager GDDM Messages, SC33-0869
EWX LANRES z/OS MVS System Messages, Vol 5 (EDG-GFS)
EZA IBM Communication Server — IP z/OS Communications Server: IP Messages Volume 1 (EZA)
EZB IBM Communication Server — IP z/OS Communications Server: IP Messages Volume 2 (EZB, EZD)
EZM Application Enabling Technology (AET)/Auto UNIX System OS/390 Application Enabling Technology: Administration and Programming, GC28–1993

OS/390 Application Enabling Technology: Customization Guide, GC28–1994

OS/390 MVS System Messages (EWX-IEB), GC28–1786

EZY z/OS Communication Server — IP z/OS Communications Server: IP Messages Volume 3 (EZY)
EZZ z/OS Communication Server — IP z/OS Communications Server: IP Messages Volume 4 (EZZ, SNM)
FAN(G) REXX/370 compiler IBM Compiler and Library for SAA REXX/370 User's Guide and Reference , SH19-8160
FDBX z/OS UNIX System Services z/OS UNIX System Services Messages and Codes
FLM Software configuration and library manager z/OS ISPF Messages and Codes
FOMC z/OS UNIX System Services z/OS UNIX System Services Messages and Codes
FOMF z/OS UNIX System Services z/OS UNIX System Services Messages and Codes
FOMI z/OS UNIX System Services z/OS UNIX System Services Messages and Codes
FOMM z/OS UNIX System Services z/OS UNIX System Services Messages and Codes
FOMO z/OS UNIX System Services z/OS UNIX System Services Messages and Codes
FOMOA z/OS UNIX System Services z/OS UNIX System Services Messages and Codes
FOMOG z/OS UNIX System Services z/OS UNIX System Services Messages and Codes
FOMOH z/OS UNIX System Services z/OS UNIX System Services Messages and Codes
FPG Hardware Accelerator Manager z/OS MVS System Messages, Vol 5 (EDG-GFS)
FSUM z/OS UNIX System Services z/OS UNIX System Services Messages and Codes
FSUMA z/OS UNIX System Services z/OS UNIX System Services Messages and Codes
FSUMB z/OS UNIX System Services z/OS UNIX System Services Messages and Codes
FSUMF z/OS UNIX System Services z/OS UNIX System Services Messages and Codes
FOR LE FORTRAN Library IBM Language Environment for MVS & VM FORTRAN Run-Time Migration Guide
GDE Distributed FileManager/MVS (DFM/MVS) z/OS MVS System Messages, Vol 5 (EDG-GFS)
GFSA Network File System Server z/OS Network File System Guide and Reference
GFSC Network File System Server Client Messages z/OS Network File System Guide and Reference
GIM SMP/E SMP/E for z/OS Messages, Codes, and Diagnosis
GQD Graphical Data Display Manager GDDM Messages
GQF Graphical Data Display Manager GDDM Messages
GSK Integrated Cryptographic Service Facility (ICSF) z/OS Cryptographic Services System SSL Programming
HIS Hardware instrumentation services (HIS) z/OS MVS System Messages, Vol 6 (GOS-IEA)
HWI Base Control Program Internal Interface Services z/OS MVS System Messages, Vol 6 (GOS-IEA)
HZS IBM Health Checker for z/OS z/OS MVS System Messages, Vol 6 (GOS-IEA)

IBM Health Checker for z/OS User's Guide

HZR Runtime Diagnostics z/OS MVS System Messages, Vol 6 (GOS-IEA)

z/OS Problem Management

IAR Real storage manager (RSM) z/OS MVS System Messages, Vol 6 (GOS-IEA)

z/OS MVS Dump Output Messages

IARH Real storage manager (RSM) z/OS MVS System Messages, Vol 6 (GOS-IEA)
IAT JES3 z/OS JES3 Messages
IAZ JES common z/OS MVS System Messages, Vol 6 (GOS-IEA)
IAZH JES common health check z/OS MVS System Messages, Vol 6 (GOS-IEA)
ICE DFSORT sort program z/OS DFSORT Messages, Codes and Diagnosis Guide
ICH Resource Access Control Facility (RACF®) z/OS Security Server RACF Messages and Codes
ICK Device Support Facilities Device Support Facilities User's Guide and Reference, GC35-0033
ICM IBM Content Manager Enterprise Edition IBM Content Manager Enterprise Edition: Messages and Codes
ICN NCP/SSP/EP NCP/SSP/EP Messages and Codes, SC30-3169
ICP Input/Output Configuration Program (IOCP) z/OS MVS System Messages, Vol 6 (GOS-IEA)

Input/Output Configuration Program User's Guide and Reference, GC28-1027

ICQA Information Center Facility administrator messages z/OS TSO/E Messages
ICQC Information Center Facility user messages z/OS TSO/E Messages
ICT Programmed Cryptographic Facility z/OS MVS System Messages, Vol 6 (GOS-IEA)
ICU Cryptographic Unit Support z/OS MVS System Messages, Vol 6 (GOS-IEA)
IDA Virtual Storage Access Method (VSAM) z/OS MVS System Messages, Vol 6 (GOS-IEA)
IDC Access method services z/OS MVS System Messages, Vol 6 (GOS-IEA)
IEA
  • Allocation/unallocation
  • Auxiliary storage manager (ASM)
  • Contents supervision
  • Communications task (COMMTASK)
  • Data Facility Product (DFP) components
  • Generalized trace facility (GTF)
  • Initial program load (IPL)
  • Input/output supervisor (IOS)
  • Master scheduler
  • Nucleus initialization program (NIP)
  • Program Call authorization (PC/AUTH) service routines
  • Reconfiguration
  • Recovery termination manager (RTM)
  • Supervisor control
  • System resources manager
  • System trace
  • Timer supervision
  • Virtual storage management (VSM)
z/OS MVS System Messages, Vol 6 (GOS-IEA)

z/OS MVS Dump Output Messages

IEAH SDUMP (SCDMP) z/OS MVS System Messages, Vol 6 (GOS-IEA)
IEATH Timer supervision z/OS MVS System Messages, Vol 6 (GOS-IEA)
IEAVEH Supervisor Control z/OS MVS System Messages, Vol 6 (GOS-IEA)
IEAVTRH Recovery Termination Manager (RTM) z/OS MVS System Messages, Vol 6 (GOS-IEA)
IEB Data Facility Product (DFP) utilities z/OS MVS System Messages, Vol 7 (IEB-IEE)
IEC
  • OPEN/CLOSE/EOV
  • DADSM
  • Access methods
z/OS MVS System Messages, Vol 7 (IEB-IEE)

z/OS DFSMSdfp Diagnosis

IEE
  • Auxiliary storage manager (ASM)
  • Communications task (COMMTASK)
  • Data Facility Product (DFP) components
  • JES2
  • JES3
  • Master scheduler
  • Reconfiguration
  • Recovery termination manager (RTM)
  • Supervisor control
  • System management facilities (SMF)
  • System resources manager (SRM)
  • System trace
  • Task management
  • Timer supervision
z/OS MVS System Messages, Vol 7 (IEB-IEE)

z/OS MVS Dump Output Messages

IEF
  • Allocation/unallocation
  • Converter/interpreter
  • Data Facility Product (DFP) components
  • Initial program load (IPL)
  • Initiator/terminator
  • JES/scheduler services
  • JES2
  • Master scheduler
  • Master subsystem/subsystem interface (MSI)
  • Reconfiguration
  • Scheduler JCL facilities (SJF)
  • Scheduler restart
  • Scheduler services (ENF)
  • System management facilities (SMF)
z/OS MVS System Messages, Vol 8 (IEF-IGD)

z/OS MVS Dump Output Messages

IEFC Converter z/OS MVS System Messages, Vol 8 (IEF-IGD)
IEFI Converter/interpreter z/OS MVS System Messages, Vol 8 (IEF-IGD)
IEH Data Facility Product (DFP) utilities z/OS MVS System Messages, Vol 8 (IEF-IGD)
IEV Assembler H Assembler H Version 2 Application Programming: Guide, SC26-4036
IEW
  • Linkage editor
  • Binder
  • Transport utility
  • Loader
z/OS MVS System Messages, Vol 8 (IEF-IGD)
IFA System management facilities (SMF) z/OS MVS System Messages, Vol 8 (IEF-IGD)

z/OS MVS Dump Output Messages

IFB Input/output environment recording routines: OBR and SVC 76 z/OS MVS System Messages, Vol 8 (IEF-IGD)
IFC IFCDIP00 service aid for the logrec data set

IFCEREP0 and IFCEREP1 service aids

z/OS MVS System Messages, Vol 8 (IEF-IGD)

Environmental Record Editing and Printing Program (EREP) User's Guide and Reference, GC28-1378

IFD Online test executive program (OLTEP) OS/390® MVS System Messages, Vol. 4, GC28-1787
IFL Network Control Program (NCP)

Advanced Communications Function (ACF) for Network Control Program (NCP)

3704 and 3705 Control Program Generation and Utilities Guide and Reference Manual, GC30-3008

Network Control Program/System Support Programs/Emulation Programs Messages and Codes, SC30-3169

IFO MVS Assembler OS/VS - VM/370 Assembler Programmer's Guide, GC33-4021
IGD Storage management subsystem (SMS) of Data Facility Product (DFP) z/OS MVS System Messages, Vol 8 (IEF-IGD)

z/OS MVS Dump Output Messages

IGF Dynamic device reconfiguration (DDR) Machine check handler (MCH) z/OS MVS System Messages, Vol 9 (IGF-IWM)
IGGHC DFSMS Catalog z/OS MVS System Messages, Vol 9 (IGF-IWM)
IGGN Data Facility Product (DFP) z/OS MVS System Messages, Vol 9 (IGF-IWM)
IGV Virtual storage management (VSM) z/OS MVS System Messages, Vol 9 (IGF-IWM)
IGW Data Facility Product (DFP) Storage management subsystem (SMS) z/OS MVS System Messages, Vol 9 (IGF-IWM)

z/OS MVS Dump Output Messages

IGY VS COBOL II VS COBOL II Application Programming Guide, SC26-4045
IGZ VS COBOL II VS COBOL II Application Programming: Debugging

z/OS Language Environment Debugging Guide

IHJ Data Facility Product (DFP) checkpoint/scheduler restart z/OS MVS System Messages, Vol 9 (IGF-IWM)
IKF VS COBOL II VS COBOL II Application Programming: Debugging, SC26-4049
IKJ Time Sharing Option Extensions (TSO/E) z/OS TSO/E Messages

z/OS MVS System Messages, Vol 9 (IGF-IWM)

z/OS MVS Dump Output Messages

IKM Programming Language/I (PL/I) syntax checker z/OS MVS System Messages, Vol 9 (IGF-IWM)
IKT Time Sharing Option Extensions (TSO/E)

IBM Communications Server — SNA

z/OS TSO/E Messages, SC27-0614, SC27-0470, SC23-0114

z/OS Communications Server: SNA Messages

ILM IBM License Manager z/OS MVS System Messages, Vol 9 (IGF-IWM)
ILR Auxiliary storage manager (ASM) z/OS MVS System Messages, Vol 9 (IGF-IWM)
ILX VS FORTRAN Compiler VS FORTRAN Version 2 Programming Guide for CMS and MVS, SC26-4222
IHV Tivoli System Automation for z/OS IBM System Automation for z/OS
ING Tivoli System Automation for z/OS IBM System Automation for z/OS
INM Interactive Data Transmission Facility (IDTF) TRANSMIT and RECEIVE commands z/OS TSO/E Messages
IOAC Open Systems Adapter-Express® (OSA-Express) z Systems OSA-Express Customer's Guide and Reference
IOP Input/output configuration program (IOCP) z/OS MVS System Messages, Vol 9 (IGF-IWM)
IOS Input/output supervisor (IOS) z/OS MVS System Messages, Vol 9 (IGF-IWM)

z/OS MVS Dump Output Messages

IPD FORTRAN syntax checker z/OS MVS System Messages, Vol 9 (IGF-IWM)
IQP PCI Express z/OS MVS System Messages, Vol 9 (IGF-IWM)
IRA System resources manager (SRM) z/OS MVS System Messages, Vol 9 (IGF-IWM)

z/OS MVS Dump Output Messages

IRD ESCON Director Device Support (EDDS) z/OS MVS System Messages, Vol 9 (IGF-IWM)
IRR Resource Access Control Facility (RACF) z/OS Security Server RACF Messages and Codes
IRX Time Sharing Option Extensions (TSO/E) restructured extended executor language (REXX) z/OS TSO/E Messages
ISG Global resource serialization z/OS MVS System Messages, Vol 9 (IGF-IWM)

z/OS MVS Dump Output Messages

ISN Service Processor Interface z/OS MVS System Messages, Vol 9 (IGF-IWM)
ISP Interactive System Productivity Facility z/OS ISPF Messages and Codes
ISQ Tivoli System Automation for z/OS IBM System Automation for z/OS
ISRB Interactive system productivity facility z/OS ISPF Messages and Codes
ISRL Library management facility z/OS ISPF Messages and Codes
IST IBM Communications Server — SNA z/OS Communications Server: SNA Messages
ISU IBM Communications Server — SNA z/OS Communications Server: SNA Messages
ITA TOLTEP for Advanced Communications Function for Virtual Telecommunications Access Method (ACF/VTAM®) Advanced Communications Function for VTAM Messages and Codes, SC27-0614, SC27-0470, SC23-0114
ITT Component trace z/OS MVS System Messages, Vol 9 (IGF-IWM)

z/OS MVS Dump Output Messages

ITV Data-in-virtual z/OS MVS System Messages, Vol 9 (IGF-IWM)

z/OS MVS Dump Output Messages

ITZ Transaction trace z/OS MVS System Messages, Vol 9 (IGF-IWM)

z/OS MVS Dump Output Messages

IST IBM Communications Server — SNA z/OS Communications Server: SNA Messages
IVT IBM Communications Server — SNA z/OS Communications Server: SNA Messages
IWM Workload manager (WLM) z/OS MVS System Messages, Vol 9 (IGF-IWM)

z/OS MVS Dump Output Messages

IXC Cross-system coupling facility (XCF) z/OS MVS System Messages, Vol 10 (IXC-IZP)

z/OS MVS Dump Output Messages

IXG System logger (SCLOG) z/OS MVS System Messages, Vol 10 (IXC-IZP)
IXL Cross System Extended Services (XES) z/OS MVS System Messages, Vol 10 (IXC-IZP)

z/OS MVS Dump Output Messages

IXP Input/output configuration program (IOCP) z/OS MVS System Messages, Vol 10 (IXC-IZP)
IXZ JES common coupling services (JESXCF) z/OS MVS System Messages, Vol 10 (IXC-IZP)

z/OS MVS Dump Output Messages z/OS MVS Dump Output Messages

IYP Input/output configuration program (IOCP) z/OS MVS System Messages, Vol 10 (IXC-IZP)
IZP Input/output configuration program (IOCP) z/OS MVS System Messages, Vol 10 (IXC-IZP)

ES/9000 IOCP User's Guide and ESCON CTC Reference Volume A04, GC38-0401

SNM IBM Communication Server — IP z/OS Communications Server: IP Messages Volume 4 (EZZ, SNM)
USS IBM Communications Server — SNA z/OS Communications Server: SNA Messages