Availability Guide for Application Design

Glossary
Availability Guide for Application Design—525637-004
Glossary-12
intelligent device support (IDS)
intelligent device support (IDS). A feature of Pathway that allows COBOL requester
programs to interact with external (other than Pathway) processes that, in turn, control
intelligent devices such as personal computers, automated teller machines, and point-
of-sale devices.
interprocess communication (IPC). The exchange of messages between processes in a
system or network.
IOP. See input/output process (IOP).
IPC. See interprocess communication (IPC).
LAN. See local area network (LAN).
link. An open of a server process within a server class. See also Link manager process.
Link manager process. A process that supports access to NonStop TS/MP server classes
from client or requester programs.
load balancing. The technique of improving performance through enhanced parallelism by
distributing processes among processors such that each processor carries a similar
workload.
local area network (LAN). A set of computers, word processors, and other electronic
devices linked to create an interoffice or inter-site network.
lock. A mechanism that coordinates access to the same data. Locks are either shared or
exclusive.
lockstepped processors. Two processors that execute identical code and remain always
synchronized. If the output of the two processors is ever different, a processor failure is
assumed.
logical unit. The port through which a user can access the services and communication
facilities with an SNA network.
loosely coupled architecture. Processors within a system that do not share memory.
LU2. The type of logical unit used for communicating with 3270 terminals. See also logical
unit.
machine. The Tuxedo term for a node in an Expand network.
maintainability. A measure of how quickly a downed application can be brought back
online and once again made available to the end-user community.
management application. An application that automates configuration and control tasks.
For example, a management application can request from the Pathway PATHMON
process the same kinds of services that system managers can request interactively
using the Pathway PATHCOM interface.