OSI/MHS Gateway Programmatic Interface (GPI) Reference Manual

Glossary
OSI/MHS Gateway Programmatic Interface (GPI) Reference Manual—522223-001
Glossary-15
message
message. A communication, typically consisting of multiple, related data elements and
control information.
In X.400, an information object that consists of an envelope and its contents. The
envelope identifies the originator and the potential recipient of the message and
documents its path through the system.
message store. The part of an MHS subsystem that provides capabilities for message storage.
message transfer agent. See MTA.
MHS (Message Handling System). A set of components providing for exchange of various
types of information, such as interoffice memoranda, among correspondents in a
network. An MHS consists of MTAs for message transfer, message stores for message
storage, and user agents to represent X.400 users.
MHS manager. The OSI/MHS manager process. The MHS manager runs as a NonStop™
process pair. The process name is made up of a dollar sign ($) followed by one
alphabetic and up to three alphanumeric characters: for example, $ZMHS. See also
manager process.
MIB (management information base). A database used by the OSI manager process to
store and retrieve configuration information and information about applications.
mnemonic O/R address. An O/R address that identifies a user by terms that are easily
remembered. See also numeric O/R address.
MON object. An object type, used in OSI/MHS management interfaces, that enables you to
address commands to the OSI/MHS manager process. The MON object name identifies
the MHS manager process.
MOTIS (Message-Oriented Text Interchange System). The ISO standard for message
handling systems, which is nearly the same as the CCITT X.400 standard.
MPDU (message protocol data unit). A user message, a probe, or a delivery report. An
MPDU can contain other, subordinate PDUs.
MR (message relay) class. The OSI/MHS CLASS object that identifies the set of all MR
groups in an OSI/MHS subsystem.
MR group. The OSI/MHS group that implements the message transfer function. The MR
group consists of three processes: MRP, RTS, and SC. There is one PDU store in each
MR group. Each OSI/MHS subsystem must contain at least one MR group.
MRP (message relay process). A process in the MR group that encodes and decodes
message headers, routes messages, schedules messages for delivery, and performs other
related functions.
MS (message store) class. The OSI/MHS CLASS object that identifies the set of all MS
groups in an OSI/MHS subsystem.