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Glossary
OSI/FTAM Responder Manual—425199-001
Glossary-23
service user. An entity that uses services provided to it by a lower-layer entity. For
example, the FTAM initiator is a service user of ACSE and presentation services
provided by OSI/AS. Contrast service provider.
session address. See SSAP.
Session Layer. Layer 5 in the OSI Reference Model. This layer allows the setup and
termination of communication sessions between systems on the network.
session selector. See SSEL.
session service access point. See SSAP.
simplification. The process of deriving one document from another document of a
different type by discarding structural information. In particular, the act of reading a file
of a specific FTAM document type as a less structured, or simpler, FTAM document
type.
SPDU (session protocol data unit). See PDU.
SPI (Subsystem Programmatic Interface). A set of procedures and associated
definition files used on Compaq NonStop systems to define common message-based
interfaces for communication between requesters and servers—for example, in a
management application. The SPI interface to Compaq FTAM is not available for
customer use.
SQL (structured query language). A fourth-generation-language standard that provides
a means to access and associate data in a relational database.
SSAP (session service access point). A network-unique address in the Session Layer
through which connections are established and maintained; also called session address.
SSEL (session selector). A logical address in the Session Layer through which session
services are made available.
state. (1) The condition at a particular point in the OSI protocol. See also protocol
state machine. (2) In DSM, the current condition of an object that indicates its
readiness to do work. States for PROCESS objects include STARTED, STOPPED,
SUSPENDED, and UNKNOWN. The only state for SU objects is STARTED; the only
state for SUBSYS objects is DEFINED. See also state transition; also called summary
state.
state machine. See protocol state machine.
state-result parameter. A parameter, returned in indications and confirms for primitives
that establish a regime, that indicates whether or not the remote responder has
established the requested regime. The valid values are success (ZFTM-VAL-STATE-
SUCCESS in the FTAM API) and failure (ZFTM-VAL-STATE-FAILURE in the FTAM
API). Note that this parameter is not returned for primitives that cannot fail, such as F-
DELETE, F-CLOSE, and F-DESELECT. For such primitives, only action-result is
returned. See action-result parameter.
state transition. In DSM, a condition that exists when a process is in transition from
one state to another. State transitions for PROCESS objects include ABORTING,
STARTING, STOPPING, and SUSPENDING. Also called summary-state transition.