SNAX/APC Configuration and Management Manual

Introduction
SNAX/APC Configuration and Management Manual—138787
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The SNAX/APC Process
D-series or G-series environment. The D-series or G-series environment uses high PINs
(process identification numbers). The SNAX/APC process (APCOBJ) can open
processes that run at high PINs and accepts requesters that are running at either high or
low PINs.
The SNAX/APC Dispatcher and SNAX/APC Application Prototype Simulator (APS)
System do not support high PINs. The Dispatcher and APS are Pathway application
requesters written in SCREEN COBOL, and their ability to run at high PINs is
dependent on their control programs. They can run at high PINs if they are run under
the D-series or G-series Pathway (or NonStop TS/MP and Pathway/TS) and Enable
software.
The SNAX/APC Trace Analysis Program (APCTAP) does not support D-series or G-
series high PINs. It must run at low PINs.
The SNAX/APC Process
SNAX/APC is a multi-threaded process that uses a Tandem SNA access method
(SNAX/XF, SNAX/APN, or SNAX/CDF) to communicate with the SNA network. The
SNAX/APC process uses standard Tandem file-system calls to interface to the selected
access method. For further information, refer to the following Tandem manuals:
•
SNAX/XF Application Programming Manual.
•
SNAX/CDF Application Programming Manual.
Each SNAX/APC process can support up to 1024 LU-LU sessions, for both
single-session and parallel-session configurations. More than one copy of the
SNAX/APC process can co-exist in a single Tandem system.
The SNAX/APC process supports D-series or G-series high PINs. It can open other
processes that run at high PINs and accept requesters that are running at either high or
low PINs. SNAX/APC itself can run at either a high PIN or a low PIN. Refer to the
subsection entitled High Pin Support by SNAX/APC
, for complete information on how
to control whether SNAX/APC runs a high or a low PIN.
The SNAX/APC Configuration Interface
The SCF subsystem is used to configure the SNAX/APC system. SCF commands are
used to add the names of the local TPs, the local and remote LUs, and the partner
(Loomed) pairs used for communication. The configuration information is stored in a
single file, called the configuration database. The system manager or operator uses SCF
when initially configuring SNAX/APC or when adding new LUs or TPs to the system.
For further information on the use of SCF, see Section 4, Configuring Network
Resources for SNAX/APC and Part II, SCF Reference for SNAX/APC.
The SNAX/APC Dispatcher
The SNAX/APC Dispatcher is a SCREEN COBOL program that uses the PATHMON
process to start a TP when one is requested by a remote LU. This feature is used under
PATHMON control, with TPs configured as servers. The SNAX/APC process must be a
Pathway server to use the Dispatcher.