OSI/FTAM Programming Reference Manual

Glossary
HP NonStop OSI/FTAM Programming Reference Manual—528611-001
Glossary-24
SCF kernel.
SCF kernel. The part of the SCF software that provides subsystem-independent functions,
such as accepting user input commands.
SCP (Subsystem Control Point). The process used to provide the focal point for all
NonStop data communications subsystems. There can be several instances of this
process. Applications using SPI send all commands for data communications
subsystems to an instance of this process, which in turn sends the commands on to
the manager processes of the target subsystems. SCP also processes a few
commands itself. It provides security features, version compatibility, support for tracing,
and support for applications implemented as process pairs.
second-level data types. DDL data types made up of one or more first-level data types.
See first-level data types.
security group. File attributes that pertain to security and access control. These attributes
are negotiated at association establishment. The security group attributes are access
control and legal qualifications. sender. The entity that initiates and sends a
communication to a remote receiver. See receiver.
sensitive command. An SCF command that can be issued only by a restricted set of
Guardian users, such as process owners and super-group users. For NonStop data
communications subsystems, the sensitive commands are those that can change the
state or configuration of objects, start or stop tracing, or change the values of statistics
counters. Contrast with nonsensitive command.
sequential flat file. An unstructured file whose data must be accessed sequentially.
service. The functions and features provided by a given layer to the layer above it in the
OSI Reference Model. Also, the functions and features provided to the application
programmer by the NonStop FTAM process. See also protocol.
service class. A set of functional units negotiated at association establishment. ISO FTAM
specifies five levels of service classes.
service ID. A value identifying the NonStop OSI service that is the source of an error
condition being reported. The APS_STATUS_ procedure returns service ID values in
the service-id parameter and within the structure returned in the original-
error-info parameter. See also original-error-info parameter.
service primitive. An abstract, implementation-independent interaction between a service
user and a service provider. Service primitives describe the sequences of events
between adjacent layers that occur through the service access point (SAP). There are
four types of service primitives. See also request primitive., indication primitive.,
response primitive., and confirm primitive.
service provider. An entity that provides services for a higher-layer entity. For example, the
FTAM initiator is a service provider, providing FTAM services to an FTAM application
program. Contrast service user.