Telserv Manual

Glossary
Telserv Manual—427174-009
Glossary-6
Subsystem ID (SSID)
provides security features, version compatibility, support for tracing, and support for
applications implemented as NonStop™ process pairs.
Subsystem ID (SSID). 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, 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.
Subsystem Programmatic Interface (SPI). In DSM, a set of procedures and associated
definition files used to define common message-based programmatic interfaces for
communication between requesters and servers—for instance, in a management
application. SPI includes procedures to build and decode specially formatted
messages; definition files in Pascal, TAL, C, COBOL85, and TACL for inclusion in
programs, macros, and routines using the SPI procedures; and definition files in DDL
for programmers writing their own subsystems.
subsystem. (1) The software and/or hardware facilities that provide users with access to a
set of communications service. (2) For 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.
summary state. In DSM interfaces to NonStop data communications subsystems, one of
the generally defined possible conditions of an object, with respect to the management
of that object. A summary state differs from a state in two ways. First, a summary state
pertains to the management of an object, whereas a state may convey other kinds of
information about the object. Second, summary states are defined the same way for all
NonStop data communications subsystems, whereas the set of possible states differs
from subsystem to subsystem. The management programming interfaces to NonStop
data communications subsystems refer to summary states rather than to states. The
Telserv summary states are STARTED and STOPPED.
TELNET. The Internet standard protocol for remote terminal connection service. TELNET
allows a user at one site to interact with remote timesharing systems at another site
just as if the user’s terminal is connected directly to the remote machine. That is, the
user invokes a TELNET application program that connects to a remote machine,
prompts for a login ID and password, then passes keystrokes from the user's terminal
to the remote machine and displays output from the remote machine on the user's
terminal.
terminal emulation . On PC or Macintosh systems, a program on the workstation that
allows the workstation to be used as (emulate) a 6530 terminal.
Transmission Control Protocol (TCP). The Internet standard transport-level protocol that
provides the reliable, full-duplex stream service on which many application protocols
depend. TCP allows a process on one machine to send a stream of data to a process
on another. It is connection-oriented, in the sense that before transmitting data