OSI/MHS Gateway Programmatic Interface (GPI) Reference Manual

Glossary
OSI/MHS Gateway Programmatic Interface (GPI) Reference Manual—522223-001
Glossary-19
originator
originator. The person or application that prepares and submits messages for delivery
through an X.400 message handling system.
O/R (originator/recipient) address. A list of attributes that describes a user and locates that
user in relation to the physical or organizational structure of the MHS or the underlying
network. An O/R address, which is part of the O/R name, provides routing information
for an X.400 message handling system.
O/R (originator/recipient) name. A list of attributes that identifies a user as an originator or
potential recipient of a message or probe. An O/R name contains an O/R address.
OSI (Open Systems Interconnection). A set of standards used for the interconnection of
heterogeneous computer systems, thus providing universal connectivity.
OSI manager process. A process in the OSI/AS subsystem that performs subsystem
management functions. The OSI manager is the focal point for all OSI management
activities. It maintains a management information base (MIB) that contains the
configuration information about the OSI environment. There is one OSI manager
process per OSI/AS subsystem.
OSI/MHS (Open Systems Interconnection/Message Handling System). The Compaq
implementation of an X.400 message handling system for Compaq NonStop™ systems.
OSI/MHS database. The database that consists of the registration database and OSI/MHS
configuration database.
OSI/MHS ISV. The installation subvolume for the OSI/MHS release. The Install process
creates this subvolume as ZOSIMHS.
OSI/MHS subsystem. The set of all processes and files defined through the installation
procedure, and through SCF or management applications, to be part of an OSI/MHS
environment, under control of a specified MHS manager. There can be more than one
OSI/MHS subsystem on a Compaq NonStop™ system.
OSI/MHS subvolume. The subvolume that contains all files required by an OSI/MHS
subsystem, such as executable object and configuration files. The MHS manager must
always reside in this subvolume, but some of the other executable files can reside
elsewhere, as defined by the MHS manager.
OSI Reference Model. A communications architecture, adopted by the ISO in 1984, that
includes seven layers that define the functions involved in communications between two
systems, the services required to perform these functions, and the protocols associated
with these services. See also layer.
OSI services. The Compaq implementation of the OSI Reference Model. OSI services
consist of an OSI manager process and a number of subordinate protocol processes. The
protocol processes handle OSI protocols and provide layer services. The network
service provider, NSP, handles layers 1 through 3 and is provided by access methods
such as X25AM and TLAM. The transport service provider, TSP, handles Layer 4 and
is provided by OSI/TS. The TSP process also provides Layer 3 for LANs. The session,