OSI/MHS Gateway Programmatic Interface (GPI) Programming Guide

Glossary
OSI/MHS Gateway Programmatic Interface (GPI) Programming Guide—424822-001
Glossary-18
nondelivery report
nondelivery report. A report generated by the MRP when it cannot deliver a message to the
recipients, or when it cannot deliver a report to the originator of the message or probe.
nonreceipt notification. An indication to the sender of a communication that the
communication was not received by the intended recipients.
nonsensitive command. A DSM command that can be issued by any user or program having
access to the target subsystem—that is, a command on which the subsystem imposes no
further security restrictions. For Compaq data communications subsystems, the
nonsensitive commands are usually information commands (commands that cannot
change the state or configuration of objects). See also sensitive command.
Nonstop operating system. The operating system for Compaq NonStop systems.
NonStop SQL. A relational database management system that combines the ease of use of
the Structured Query Language (SQL) with the application performance provided by the
Guardian 90 operating system.
NSAP (network service access point). The logical point at which Network Layer services
are provided by the Network Layer entity to the Transport Layer entity.
NSAP address. The global, network-unique address of an end system’s network service
access point, through which Network Layer services are provided to local users, and
through which Transport Layer services are provided to remote systems.
null object. An object type, used in management interfaces, that occurs when a subsystem
supports exactly one object of a given type and the type of that object can be deduced
from the name. In OSI/MHS, the object type need not be specified in the VERSION or
NAMES command: the object is understood to be the MHS manager. The null object
has no inherent hierarchical relationship to any other object.
null value. A value indicating that a program has made no explicit assignment to a variable
or field. In DSM programmatic interfaces, a field in a structure has a null value if the
application has made no explicit assignment to that field after calling the SSNULL
procedure to initialize the structure.
numeric O/R address. An O/R address that identifies a user by a number. See also
mnemonic O/R address.
OBEY file. See command file.
object. In general, an entity subject to independent reference or control, and having well-
defined characteristics or behavior.
In DSM, an entity subject to independent reference and control by a subsystem: for
example, the disk volume $DATA or the data communications line $X2502. An object
typically has a name and a type known to the controlling subsystem.
In GPI, a collection of elements (called “attributes”) used for constructing messages.
See also root object, subobject, and superobject.