OSI/MHS Gateway Programmatic Interface (GPI) Reference Manual

Glossary
OSI/MHS Gateway Programmatic Interface (GPI) Reference Manual—522223-001
Glossary-17
node
node. In general, a system or device that follows the protocols of a specific network and that
other systems or devices in that network can address.
In Expand (the Compaq proprietary network), a computer system that is part of a
Compaq Expand network of computer systems. A node address is designated by a
symbol before the name (for example, \NY in Guardian 90 file names or @NY in
Transfer correspondent names).
nonadjacent MTA. An MTA in the X.400 network that has no direct path to your OSI/MHS
subsystem. See also adjacent MTA or remote MTA.
noncritical event. A DSM event that is not crucial to system or network operations. Each
subsystem determines which of its events are noncritical by setting the value of the
emphasis token to FALSE. See also critical event.
nonconfigured object. An object whose characteristics have not been specified to OSI/MHS
through SCF or through a management application that issues programmatic commands.
See also configured object.
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™ 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