SNAX/APC Configuration and Management Manual

Glossary
SNAX/APC Configuration and Management Manual—138787
Glossary-9
PATHMON environment
PATHMON environment . The servers, server classes, TCPs, terminals, SCREEN COBOL
programs, and tell messages that run together under the control of one PATHMON
process.
Pathway. A group of software tools for developing and monitoring OLTP (on-line transaction
processing) applications that use the requester/server model. Requesters can be either
SCREEN COBOL programs interpreted by the terminal control process (TCP) or C,
C++, COBOL85, Pascal, or TAL programs that use Pathsend procedure calls. Servers
are grouped into server classes to perform the requested processing. On Himalaya
systems, this group of tools is packaged as two separate products: NonStop TS/MP and
the optional Pathway/TS. On earlier Tandem systems, the tools are packaged as a single
product called Pathway.
physical unit (PU). That part of a device (hardware or software) that provides control
functions for its own node and for the other less intelligent device nodes attached to that
node.
PLU. See primary logical unit (PLU)
.
primary logical unit (PLU). The logical unit that controls a LU-LU session. Within each
LU-LU session, one of the LUs is the primary and the other is the secondary. The most
important control that the PLU exerts is the formatting and sending of the BIND request
that initiates the session.
primary process. The currently operating process of a process pair on a Tandem NonStop
system. See backup process
.
process. A program that has been submitted to the operating system for execution, or a
program that is currently running in the computer.
process pair. Two processes: a primary process that is active, and a secondary, backup
process in another CPU that is ready to take over if the primary process fails.
protocol. The set of rules governing the operation of communicating entities.
PU. See physical unit (PU)
.
RC. See return code (RC)
.
RCB. See resource control block (RCB)
.
remote TP. The transaction program with which a local transaction program communicates.
request/response (RH) header. In SNA, control information, preceding a request/response
unit (RU), that specifies the type of RU and contains control information associated with
that RU.
request/response unit (RU). In SNA, a generic term for a request unit or a response unit.