OSI/MHS Orientation Guide

Glossary

OSI/MHS Orientation Guide—424829-001

Glossary-25

Port Access Method (PAM)

apply to multiple subsystems. See also definition and definition files, data

communications standard definitions or EMS standard definitions.

SQL. See NonStop SQL.

SSAP. A logical location between the Session and Presentation Layers, through which

session services are made available to local users, and through which presentation

services are made available to remote systems.

SSEL (session selector). An address at the boundary between the Session and Presentation

Layers, through which connections are established and maintained. A single SSEL can

service one or more connections simultaneously and can refer to one or more SSAPs.

SSID (subsystem ID). In DSM programmatic interfaces, a data structure that uniquely

identifies a subsystem to SPI. It consists of the name of the owner of the subsystem

(such as Compaq), a subsystem number that identifies that particular subsystem, and a

subsystem version number. The subsystem ID is an argument to most of the SPI

procedures.

string element. The bits of a bit string or the octets of an octet string.

string segment. A portion of a string value consisting of zero or more contiguous octets of its

representation.

subject. In event management, a device, process, or other named entity about which a given

event message has information.

subnetwork. In general, a network that participates in a larger network, possibly through the

use of gateways or bridges.

In OSI, one or more intermediate systems that provide relaying and through which end

systems may establish network connections.

subobject. An object that is an attribute of another object.

SUBSYS object. An object type, used in OSI/MHS management interfaces, that identifies the

subsystem as a whole. You use the SUBSYS object to configure general aspects of the

subsystem and to inquire about the subsystem as a whole.

subsystem. The software and/or hardware facilities that provide users with access to a set of

communications services.

In DSM, a program or set of processes that manages a cohesive set of objects. Each

subsystem has a process through which applications can request services by issuing

commands defined by that subsystem; in some cases, this process is the entire

subsystem. Many subsystems also have interactive interfaces.