OSI/MHS Orientation Guide

Glossary
OSI/MHS Orientation Guide—424829-001
Glossary-6
diagnostic code. A value indicating why a message was not delivered (called a non-delivery-
diagnostic code in the X.411 standard).
DIB. See Directory Information Base.
directory. A collection of open systems that cooperate to hold a logical database of
information about a set of objects in the real world.
directory information. In the DIT, the is a collection of entries you have created the directory
to store. It consists of object entries and their attributes.
Directory Information Base (DIB). The complete set of information to which the directory
provides access, which includes all of the pieces of information that can be read or
manipulated using the operations of the directory. It consists of entries.
Directory Information Tree (DIT). The hierarchy of names in the directory. Each node of
the tree is a directory entry.
directory schema. See schema.
directory service. A set of processes that provide access to a distributed directory.
Distributed Systems Management. See DSM.
distribution list. A list of users to whom it is possible to address messages collectively. The
distribution list name logically represents the names of all members of the list.
OSI/MHS and Transfer both support distribution lists.
DIT. See Directory Information Tree.
DLIST object. An object type, used in OSI/MHS management interfaces, that identifies a
local distribution list within the Compaq OSI/MHS subsystem.
DLISTMEMBER object. An object type, used in OSI/MHS management interfaces, that
identifies an individual member of a local distribution list.
domain. A collection of nodes on an X.400 network; these are connected through MTAs.
There are two types of domains: ADMDs and PRMDs.
DSM (Distributed Systems Management). A set of tools used to manage Compaq NonStop
systems and Expand networks. These tools include the ViewPoint console application
and various other applications, the Subsystem Control Facility (SCF) for data
communications subsystems, the Subsystem Programmatic Interface (SPI), the Event
Management Service (EMS), the Distributed Name Service (DNS), and management
programming interfaces for various Compaq subsystems.
DSV (distribution subvolume). The grouping in which Compaq releases software for
installation. Names are in the form Yxxxxzzz, where xxxx is the product number and zzz
is the release number—for instance, Y9110C20. See also ISV.
element. See string element.
element of service. In OSI, a feature or function defined as part of a service.
empty response record. In DSM programmatic interfaces, a response record containing only
a return token with a value that means “no more response records.”