OSI/MHS Configuration and Management Manual

Introduction to OSI/MHS
OSI/MHS Configuration and Management Manual—424827-003
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Gateway Interface (GI) Group
Local Operations Service (LO) Process
The LO process is a single, restartable process that provides the following functions:
•
Interfaces to local users through the P7 API
•
Creation and deletion of PDUs in the MR or MS PDU stores as submit and retrieval
operations are successfully completed
•
Local Operations Service Element (LOSE) functions
LO PDU Store
Each LO group has one PDU store. The PDU store consists of a data file and a log file.
The data file contains the encoding and decoding information for the LO operations.
The log file contains records that indicate the processing steps taken on specific PDUs.
The LO PDU store serves as a work file for the LO group. These files are defined for
each LO group.
Gateway Interface (GI) Group
The gateway interface (GI) group provides an interface into MHS by providing gateway
access at the MTA level. GPI is an implementation of the X.400 Gateway Application
Program Interface as specified by the X.400 Application Program Interface Association
(XAPIA) and the X/Open Company Limited. This interface enables you to develop a
client application that provides users of your proprietary system with access to the
X.400 network through an OSI/MHS subsystem. An OSI/MHS subsystem serves as an
X.400 message transfer agent (MTA).
The GPI consists of a library of procedures and a service that implements the
procedures. You call the procedures from a client program to build and dismantle
messages and to move them between your messaging system and an X.400 network.
The procedures can be called from programs written in the Transaction Application
Language (TAL) or the C language.
The GPI processes your procedure calls, translates the messages between a
proprietary format and a functionally equivalent X.400 form, and manages the input
and output queues used for transferring messages from and to an OSI/MHS MTA. Your
program and GPI service function together as an X.400 gateway.