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HP 9000 Networking: HP-UX SNAplus2 Administration Guide > Chapter 11 Managing SNAplus2 Clients

Managing Win16 Clients

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SNAplus2 enables machines running Microsoft Windows 3.1 and Windows for Workgroups 3.11 to act as clients in the SNAplus2 domain. The SNAplus2 client software includes API libraries that are fully compatible with Microsoft SNA Server and the Windows Open Systems Architecture (WOSA), enabling applications written for SNA Server to run unchanged on the SNAplus2 Win16 client.

SNAplus2 supports the following WOSA APIs:

  • Windows APPC

  • Windows CPI-C

  • Windows LUA

  • Windows CSV

  • 3270 Emulator Interface Specification

For more information about Windows SNA APIs, see the documentation provided with Microsoft SNA Server.

SNA network information, and other information required by Win16 clients, is held in the sna.ini file.

On a Win16 client, the component that handles access to SNAplus2 servers is the network access process (NAP). The NAP must be enabled before you can use SNAplus2 applications or emulation programs on the client. For more information, see “Enabling a Win16 Client”.

When the NAP is enabled, the client contacts a server running SNAplus2 over the TCP/IP network in order to access SNAplus2 features. You can optionally set up SNAplus2 servers to enforce password checking for Win16 clients, so that the client user must enter the correct password when enabling the NAP in order to gain access to the server. For more information, see “Win16 Client Security”.

The operation of the client is also controlled by the following files:

sna.ini

Win16 client initialization file. This file contains information about the following:

  • Configuration information specific to Win16 clients

  • Servers that the client can access

  • Logging and tracing options for applications running on the client

  • Additional options for CPI-C and CSV applications running on the client

For more information about this file, see “Win16 Client Initialization File (sna.ini)”.

sna_tps.ini

Win16 client invokable TP data file. This file contains information about invokable TPs (APPC or CPI-C) that can run on the client; it is equivalent to the sna_tps file on a computer running the HP-UX operating system, as described in “Defining TPs”.

For more information about this file, see Appendix C “Configuring an Invokable TP Using snaptpinstall”

Enabling a Win16 Client

To enable the SNAplus2 software on a Win16 client, either double-click on the Windows NAP icon, or use the normal Windows “File Run” mechanisms to run wnap.exe. The client then uses the information in the sna.ini file, described in “Win16 Client Initialization File (sna.ini)”, to locate a server running SNAplus2.

If the server is set up to validate user names for Win16 clients (as described in “Win16 Client Security”), SNAplus2 displays a pop-up message requesting a password. You must type in a password. SNAplus2 uses this password and the user name configured for the Win16 client to validate that you are authorized to access the server. If the server is not set up to validate user names, the pop-up message does not appear.

If you want to enable the NAP automatically when the Windows system is started, you can include the Windows NAP icon in the “Startup” group, or list it in the [windows] section of the win.ini file as a program to be started automatically.

Disabling SNAplus2 for a Win16 Client

Before disabling the NAP, ensure that all SNAplus2 applications (3270 and 5250 emulation programs or applications using the SNAplus2 APIs) on the Win16 client have been stopped.

To disable the NAP, click on the Windows NAP icon and choose Close. If any SNAplus2 applications are running, the Close option is not selectable; if you are sure you want to disable the NAP, stop the relevant applications before retrying.

Win16 Client Security

SNAplus2 provides a facility for validating the user name and password of any Win16 client attempting to contact a server running SNAplus2. This enables you to ensure that only authorized Windows users are able to access the SNAplus2 system.

By default, Win16 client security is not active, so that any computer with the Win16 client software installed can access SNAplus2 servers. To enable Win16 client security, use the following procedure:

  1. Agree on a user name and password with each Win16 client user who is authorized to access the SNAplus2 system.

  2. On the Win16 client computer, define this user name. For Windows 3.1 or Windows for Workgroups 3.11, this name is defined using the snauser parameter in the [Configuration] section of the sna.ini file, described in “Win16 Client Initialization File (sna.ini)”.

  3. On all servers that this client can access, define this user name and password to the HP-UX system as a system user name. (The servers the client can access are specified in the sna.ini file or the Windows Program Registry.)

  4. After enabling the SNAplus2 software on a server, use the following command:

    snapwinsec domain

    This command enables Win16 client security on all servers in the SNAplus2 domain. You do not need to repeat the command when enabling the SNAplus2 software on other servers.

When a Win16 client starts up and tries to access a server on which Win16 client security is enabled, the client software displays a pop-up message requesting a password. This password and the user name from the sna.ini file are checked against the user names defined to the HP-UX system on the server. If the Win16 client user does not specify a password, or if the user name and password cannot be matched with a user name and password on the server, the server rejects the client's access attempt.

To stop using Win16 client security, so that any Win16 client user can access SNAplus2 servers without having to specify a password, use the following command:

snapwinsec off

This command removes Win16 client security on all servers in the SNAplus2 domain. You do not need to repeat the command on other servers.

Win16 Client Initialization File (sna.ini)

For Windows 3.1 or Windows for Workgroups 3.11, configuration information is kept in the sna.ini file.

The Win16 client initialization file, sna.ini, contains SNA network information (similar to the information held in the client network data file on HP-UX clients). This file also contains some additional configuration information that is specific to Win16 clients. This file is stored in the directory where the Windows software was installed (typically c:\windows); it is set up during the client installation process, and is an ASCII text file that can be modified later as required using a standard text editor.

The contents of the file are as follows:

[Configuration]
domain = domain_name
snauser = user_name
snagroup = group_name
invoked_tps = YES | NO
lan_access_timeout = nn
broadcast_attempt_count = nn
server_lost_timeout = nn
[Servers]
Server1 = * | servername1
Server2 = servername2
.
.
.
Server10 = servername10
[Logging]
exception_logging_enabled = YES | NO
audit_logging_enabled = YES | NO
log_directory = directory
error_file = error_filename
backup_error_file = backup_error_filename
error_file_wrap_size = error_file_size
audit_file = audit_filename
backup_audit_file = backup_audit_filename
audit_file_wrap_size = audit_file_size
succinct_errors = YES | NO
succinct_audits = YES | NO

[API_tracing]
file1 = trace_filename_1
file2 = trace_filename_2
flip_size = filesize
truncation_length = length
all_api = YES | NO
appc = YES | NO
cpic = YES | NO
csv = YES | NO
rui = YES | NO
nof = YES | NO
ms = YES | NO

[MSG_tracing]
file1 = msg_trace_filename_1
file2 = msg_trace_filename_2
flip_size = filesize
truncation_length = length
fmi = YES | NO

[CS_tracing]
file1 = cs_trace_filename_1
file2 = cs_trace_filename_2
flip_size = filesize
admin_msg = YES | NO
datagram = YES | NO
data = YES | NO
send = YES | NO
receive = YES | NO

[Appl_Name]
APPCTPN = tp_name
APPCLLU = lu_name

[CSV_data]
CSVTBLG = table_G_filename
NOTE: The domain = domain_name line is the only required line in this file.

The following sections explain the contents of the file. Where a parameter in the file takes the values YES or NO, any string beginning with Y or y is interpreted as YES, and any string beginning with N or n is interpreted as NO.

[Configuration]

The [Configuration] section of the file contains configuration information for the client, as follows:

domain

The domain_name argument indicates the domain name of the SNAplus2 LAN, as specified during the client installation. This line is required.

snauser

The user_name argument indicates the user name of the SNAplus2 user on this client. This name was specified during the client installation. It must match the SNAplus2 configuration and the HP-UX configuration on servers, as follows:

  • If the SNAplus2 system is set up to validate user names for Win16 clients (as described in “Win16 Client Security”), this name must be defined as a system user name on all servers listed in the parameters Server1-Server10 as described in “[Servers]” (or on all servers that can respond to UDP broadcasts, if the client uses this method to locate a server).

  • If the client will be running 3270 or 5250 emulation, and you want to configure the user explicitly instead of using the default emulator user configuration, this name must be defined as an emulator user name in the SNAplus2 configuration, using the define_emulator_user command. For more information, see “Configuring 3270 Emulator Users” or “Configuring 5250 Emulator Users”.

  • If neither of the preceding conditions applies, this line of the file is optional. If this argument is not specified, 3270 or 5250 users on the client can use either a record defined for a group of users (see the snagroup parameter) or the <DEFAULT> user record, if any, in the domain configuration file.

snagroup

The group_name argument indicates the group name of the SNAplus2 user on this client. This name must match the SNAplus2 configuration on servers, as follows:

  • If the client will be running 3270 or 5250 emulation, and you have set up the SNAplus2 configuration to include emulator records for groups of users rather than an individual record for each user, this name must match the name of an emulator user record that is defined for use by a group of users. Emulator user records are defined using the define_emulator_user command; for more information, see “Configuring 3270 Emulator Users” or “Configuring 5250 Emulator Users”.

  • If you have not set up emulator user records for groups of users, this line of the file is optional. If neither the user name nor the group name is specified, 3270 or 5250 users on the client can use the <DEFAULT> user record, if any, in the domain configuration file.

  • If the client will not be running 3270 or 5250 emulation, this line of the file is not required.

invoked_tps

Specify one of the following values:

YES

This client is used to run invoked TPs (APPC TPs that issue RECEIVE_ALLOCATE, or CPI-C applications that issue Accept_Conversation or Accept_Incoming). In this case, you may also need to define the TP on this client. For more information, see “Defining TPs” or Appendix C “Configuring an Invokable TP Using snaptpinstall”.

NO

This client is not used to run invoked TPs.

This line is optional. If it is not specified, the default is NO.

lan_access_timeout

Specify the time in seconds for which the TCP/IP connection from the client to a server should be kept active while no applications on the client are using SNAplus2 resources. For more information, see “LAN Access Timeout”.

The valid range is 0-65535. The minimum timeout is 60 seconds (lower values are rounded up to 60 seconds). To deactivate the TCP/IP connection more quickly, disable the NAP on the client.

This parameter is optional. If it is not specified, the default is no timeout, and the TCP/IP connection is kept active as long as the NAP is running on the client.

broadcast_attempt_count

If the client uses the broadcast method to contact a server (specified by the * entry described in “[Servers]”), this parameter specifies the maximum number of broadcasts to be made in one attempt to contact a server.

The valid range is 1-65535. The minimum value is 1; if a higher value is specified, the client retries every 10 seconds until it contacts a server or until this count is reached. If the count is reached without contacting a server, the client then attempts to contact a named server (as described in “[Servers]”).

This parameter is optional. If it is not specified, the default is 5.

server_lost_timeout

If the client loses contact with a server and needs to reconnect, or if it has failed to contact a server using either broadcasts or named servers (as described in “[Servers]”), this parameter specifies the time in seconds for which the client waits before attempting to contact a server. If the client has lost contact with the server, SNAplus2 does not wait for the full timeout period, but retries after a random period between 5 seconds and the specified timeout; this is to avoid bursts of network traffic caused by large numbers of clients attempting to contact a server at the same time.

This parameter is optional. The valid range is 5-65535. If it is not specified, the default is 200 (seconds).

[Servers]

The [Servers] section of the file contains information about SNAplus2 servers that the client can access, as follows:

Server1

Enter an asterisk (*) or a server name:

  • To indicate that the client should attempt to find a server running SNAplus2 by using a UDP broadcast message to all computers on its TCP/IP subnet (or on all subnets that it can access, if the client computer contains more than one LAN adapter card), specify *.

    The client retries the broadcast every 10 seconds, up to the number of attempts specified by the broadcast_attempt_count parameter, until it contacts a server. If the limit specified by broadcast_attempt_count is reached before a server has been contacted, the client then tries using directed messages to one or more named servers (specified by the following lines of the file).

  • In situations where the client cannot reach any servers using UDP broadcasts, and must use directed messages, specify the name of the first server it should try to contact. This applies in the following cases:

    • When the SNAplus2 LAN spans multiple TCP/IP subnets, and there are no SNAplus2 servers in any TCP/IP subnet that the client can access using UDP

    • When UDP support is not installed on the client.

    In other cases, the use of UDP broadcasts is optional; to specify that broadcasts should not be attempted, specify the name of the first server instead of *.

Server2-Server10

Specify the names of additional SNAplus2 servers that the client should contact, in order of preference. If the client has tried to contact a server using a UDP broadcast (or has tried to contact the server specified in Server1), but has received no response, it then attempts to contact the server specified in Server2 using a directed message. If this fails, it tries the server specified in Server3, and so on.

These server names are optional, but provide a backup mechanism if the broadcast method of locating a server fails or if the server specified by Server1 is unavailable.

If the client tries all the servers listed without success, it waits for the number of seconds specified by the server_lost_timeout parameter, then restarts the process of trying to contact a server (either with UDP broadcasts or with the first server listed).

The parameters Server2-Server10 cannot be set to * to indicate the use of UDP broadcasts. Only the Server1 parameter can be used to indicate this, because the * value must precede any server names in the file.

[Logging]

The [Logging] section of the file specifies logging options for the client. These options can be used to specify client logging settings that override the logging options specified for the domain as a whole. For more information about specifying domain logging options, see “Configuring Logging”.

If central logging is enabled, all log messages are written to a central file on a server. In this case, only the exception_logging_enabled and audit_logging_enabled parameters specified here are used; the remaining parameters are ignored.

The logging options are specified as follows:

exception_logging_enabled

Set this parameter to one of the following values:

YES

Record exception messages.

NO

Do not record exception messages.

This parameter is optional. If it is not specified, the Win16 client uses the global domain settings to determine whether exception messages are recorded. (The initial default is that exception messages are recorded.)

audit_logging_enabled

Set this parameter to one of the following values:

YES

Record audit messages.

NO

Do not record audit messages.

This parameter is optional. If it is not specified, the Win16 client uses the global domain settings to determine whether audit messages are recorded. (The initial default is that audit messages are recorded.)

log_directory

The full path of the directory where log files are stored on this client. All the log files and backup log files (specified in the following parameters) are stored in this directory.

This parameter is optional. If it is not specified, the files are stored in the Windows installation directory (typically c:\windows).

error_file

Name of the file to which error messages are written. This parameter is optional. If it is not specified, the default is sna.err.

To log error and audit messages to a single file, specify the same file name for both this parameter and the audit_file parameter.

backup_error_file

Name of the backup error log file. When the error log file reaches the size specified in error_file_wrap_size, SNAplus2 copies its contents to the backup file (overwriting any existing file), then clears the error log file.

This parameter is optional. If it is not specified, the default is bak.err.

To log error and audit messages to a single file, specify the same file name for both this parameter and the backup_audit_file parameter.

error_file_wrap_size

The maximum size of the log file specified by error_file. When a message written to the file causes the file size to exceed this limit, SNAplus2 copies the current contents of the log file to the backup log file, then clears the log file. This means that the maximum amount of disk space taken up by error log files is approximately twice the value of the error_file_wrap_size parameter.

This parameter is optional. If it is not specified, the default is 10000 (bytes). If you are logging error and audit messages to the same file, this parameter must be set to the same value as the audit_file_wrap_size parameter.

audit_file

Name of the file to which audit messages are written. This parameter is optional. If it is not specified, the default is sna.aud.

To log error and audit messages to a single file, specify the same file name for both this parameter and the error_file parameter.

backup_audit_file

Name of the backup audit log file. When the audit log file reaches the size specified in audit_file_wrap_size, SNAplus2 copies its contents to the backup file (overwriting any existing file), then clears the audit log file.

This parameter is optional. If it is not specified, the default is bak.aud.

To log error and audit messages to a single file, specify the same file name for both this parameter and the backup_error_file parameter.

audit_file_wrap_size

The maximum size of the log file specified by audit_file. When a message written to the file causes the file size to exceed this limit, SNAplus2 copies the current contents of the log file to the backup log file and clears the log file. This means that the maximum amount of disk space taken up by audit log files is approximately twice the value of the audit_file_wrap_size parameter.

This parameter is optional. If it is not specified, the default is 10000 (bytes). If you are logging error and audit messages to the same file, this parameter must be set to the same value as the error_file_wrap_size parameter.

succinct_errors

Specifies whether to use succinct logging or verbose logging in the error log file. This setting applies to both exception logs and problem logs. You can specify either of the following values:

YES

Use succinct logging: each message in the log file contains a summary of the message header information (such as the message number and log type) and the message text string and parameters. To obtain more details of the cause of the log and any action required, you can use the snaphelp utility on a computer running HP-UX.

NO

Use verbose logging: each message in the log file includes a full listing of the message header information, the message text string and parameters, and additional information on the cause of the log and any action required.

This parameter is optional. If it is not specified, the default is taken from the previous set_global_log_type command issued to the master server (or set using the Motif administration program). The initial default, before any set_global_log_type command has been issued, is to use succinct logging.

If you are using central logging, the choice of succinct or verbose logging for messages from all computers is determined by the setting of this parameter on the server acting as the central logger; this setting may either be from the set_global_log_type command, or from a set_log_type command issued to that server to override the default.

succinct_audits

Specifies whether to use succinct logging or verbose logging in the audit log file. The permitted values and their meanings are the same as for the succinct_errors parameter.

[API_tracing]

The [API_tracing] section of the file specifies API tracing options for applications running on the client. For more information about tracing, refer to HP-UX SNAplus2 Diagnostics Guide. The tracing options are specified as follows:

file1

The full path name of the trace file, or of the first trace file if tracing is to two files (see the description of the file2 parameter).

This parameter is required if you want to enable API tracing.

file2

The full path name of the second trace file. This parameter is optional; to indicate that tracing is to one file instead of two files, do not include this line.

If both file1 and file2 are specified, tracing is to two files. When the first file reaches the size specified by the flip_size parameter, the second file is cleared, and tracing continues to the second file. When this file then reaches the size specified by flip_size, the first file is cleared, and tracing continues to the first file. This ensures that tracing can continue for long periods without using excessive disk space; the maximum space required is approximately twice the value of the flip_size parameter.

flip_size

The maximum size of the trace file. If two file names are specified, tracing switches between the two files when the current file reaches this size. If only one file name is specified, this parameter is ignored; the file size is not limited.

This parameter is optional. If it is not specified, the default is 100000 (bytes).

truncation_length

The maximum length, in bytes, of the information written to the trace file for each message. If a message is longer than this, SNAplus2 writes only the start of the message to the trace file, and discards the data beyond truncation_length. This enables you to record the most important information for each message but avoid filling up the file with long messages.

This parameter is optional. If it is not specified, SNAplus2 does not truncate messages (all the data from each message is written to the file).

all_api

To trace messages for all APIs, set this parameter to YES. In this case, SNAplus2 ignores the parameters from appc through nof.

To disable tracing for all APIs, set all_api and all of the parameters from appc through nof to NO.

To trace only messages for specific APIs, set all_api to NO, and use the parameters from appc through nof to indicate which APIs to trace.

This parameter is optional. If it is not specified, the default is NO.

appc

To trace APPC API messages, set this parameter to YES; otherwise, set it to NO.

This parameter is optional. If it is not specified, the default is NO. If the all_api parameter is set to YES, this parameter is ignored, and APPC messages are traced.

cpic

To trace CPI-C API messages, set this parameter to YES; otherwise, set it to NO.

This parameter is optional. If it is not specified, the default is NO. If the all_api parameter is set to YES, this parameter is ignored, and CPI-C messages are traced.

csv

To trace CSV API messages, set this parameter to YES; otherwise, set it to NO.

This parameter is optional. If it is not specified, the default is NO. If the all_api parameter is set to YES, this parameter is ignored, and CSV messages are traced.

rui

To trace LUA RUI messages, set this parameter to YES; otherwise, set it to NO.

This parameter is optional. If it is not specified, the default is NO. If the all_api parameter is set to YES, this parameter is ignored, and LUA RUI messages are traced.

nof

To trace NOF API messages, set this parameter to YES; otherwise, set it to NO. NOF messages are not used directly by applications on Win16 clients, but are used internally by SNAplus2 components in obtaining configuration information.

This parameter is optional. If it is not specified, the default is NO. If the all_api parameter is set to YES, this parameter is ignored, and NOF messages are traced.

ms

To trace MS API messages, set this parameter to YES; otherwise, set it to NO.

This parameter is optional. If it is not specified, the default is NO. If the all_api parameter is set to YES, this parameter is ignored, and MS messages are traced.

[MSG_tracing]

The [MSG_tracing] section of the file specifies options for tracing on Win16 client 3270 emulation programs. For more information about tracing, refer to HP-UX SNAplus2 Diagnostics Guide. The tracing options are specified as follows:

file1

The full path name of the trace file, or of the first trace file if tracing is to two files (see the description of the file2 parameter).

This parameter is required if you want to enable message tracing; you also need to set the fmi parameter.

file2

The full path name of the second trace file. This parameter is optional. To indicate that tracing is to one file instead of two files, do not include this line.

If both file1 and file2 are specified, tracing is to two files. When the first file reaches the size specified by flip_size, the second file is cleared, and tracing continues to the second file. When this file then reaches the size specified by flip_size, the first file is cleared, and tracing continues to the first file. This ensures that tracing can continue for long periods without using excessive disk space; the maximum space required is approximately twice the value of the flip_size parameter.

flip_size

The maximum size of the trace file. If two file names are specified, tracing switches between the two files when the current file reaches this size. If only one file name is specified, this parameter is ignored; the file size is not limited.

This parameter is optional. If it is not specified, the default is 100000 (bytes).

truncation_length

The maximum length, in bytes, of the information written to the trace file for each message. If a message is longer than this, SNAplus2 writes only the start of the message to the trace file, and discards the data beyond truncation_length. This enables you to record the most important information for each message but avoid filling up the file with long messages.

This parameter is optional. If it is not specified, SNAplus2 does not truncate messages (all the data from each message is written to the file).

fmi

To trace 3270 messages, set this parameter to YES; otherwise, set it to NO. This parameter is optional. If it is not specified, the default is NO.

[CS_tracing]

The [CS_tracing] section of the file specifies options for client/server tracing (tracing on messages between the client and SNAplus2 servers). For more information about tracing, refer to HP-UX SNAplus2 Diagnostics Guide. The tracing options are specified as follows:

file1

The full path name of the trace file, or of the first trace file if tracing is to two files (see the description of the file2 parameter).

This parameter is required if you want to enable client/server tracing; you also need to set the trace_flags parameter.

file2

The full path name of the second trace file. This parameter is optional; to indicate that tracing is to one file instead of two files, do not include this line.

If both file1 and file2 are specified, tracing is to two files. When the first file reaches the size specified by the flip_size parameter, the second file is cleared, and tracing continues to the second file. When this file then reaches the size specified by flip_size, the first file is cleared, and tracing continues to the first file. This ensures that tracing can continue for long periods without using excessive disk space; the maximum space required is approximately twice the value of the flip_size parameter.

flip_size

The maximum size of the trace file. If two file names are specified, tracing switches between the two files when the current file reaches this size. If only one file name is specified, this parameter is ignored; the file size is not limited.

This parameter is optional. If it is not specified, the default is 100000 (bytes).

admin_msg

To trace internal messages relating to client/server topology, set this parameter to YES; otherwise, set it to NO.

This parameter is optional. If it is not specified, the default is NO.

datagram

To trace datagram messages, set this parameter to YES; otherwise, set it to NO.

This parameter is optional. If it is not specified, the default is NO.

data

To trace data messages, set this parameter to YES; otherwise, set it to NO.

This parameter is optional. If it is not specified, the default is NO.

send

To trace all data messages sent from the client to the server, set this parameter to YES; otherwise, set it to NO.

This parameter is optional. If it is not specified, the default is NO.

receive

To trace all data messages received by the client from the server, set this parameter to YES; otherwise, set it to NO.

This parameter is optional. If it is not specified, the default is NO.

[Appl_Name]

The [Appl_Name] section of the file specifies options for a CPI-C application. To set these options for one or more applications, include a section in this format for each application, and replace the Appl_Name variable with the application program's executable name (not including the .exe file name extension).

For more information about CPI-C, refer to HP-UX SNAplus2 CPI-C Programmers Guide.

The options are specified as follows:

APPCLLU

The name of the local LU that this application uses.

This parameter is optional. If it is not specified, the application attempts to use the default LU (the LU associated with a local node's control point).

APPCTPN

The TP name of the application. This name is used in log and trace files to identify the application. For an invoked application (one that issues Accept_Conversation), it is also used to match the TP name on an incoming Allocate request with the correct application; the invoked application can also use the Specify_Local_TP_Name call to specify additional names to be matched with incoming Allocate requests.

This parameter is optional. If it is not specified, the default is CPIC_DEFAULT_TPNAME.

[CSV_data]

The [CSV_data] section of the file specifies options for applications that use the CSV interface. It applies only to applications that use the CONVERT verb to perform character conversion with a user-defined conversion table (Table G). For more information about the CONVERT verb, refer to HP-UX SNAplus2 CSV Programmers Guide.

If no applications on the client use this function, you do not need to include this section.

The only option in this section is as follows:

CSVTBLG

The full path name of the file containing the user-defined Table G conversion table. This parameter is required if CSV applications need to perform Table G character conversion (there is no default); otherwise it is optional.

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