OSI/MHS Gateway Programmatic Interface (GPI) Reference Manual

Glossary
OSI/MHS Gateway Programmatic Interface (GPI) Reference Manual—522223-001
Glossary-20
outbound communication
presentation, and application services provider, TAPS, handles layers 5, 6, and 7, and is
provided by OSI/AS.
outbound communication. A communication sent to the X.400 network from a client. See
also inbound communication.
output queue. A queue for messages, probes, and reports that are outbound from the gateway
application to X.400.
P1-encoded object. The BER-encoded form of a P1 message. See also BER and P1 message.
P1 protocol. The X.400 message transfer protocol, which defines the transfer of messages
between two message transfer agents (MTAs).
P1 message. An X.400 message that consists of an envelope and its content. The envelope
contains delivery information; the content is the actual information that is to be
delivered to the recipient.
P2 protocol. The X.400 interpersonal message (IPM) user agent protocol, which defines the
format by which one user agent (UA) sends an interpersonal message (IPM) to one or
more other UAs.
P2 message. An X.400 message that consists of a heading followed by a series of data
blocks, called body parts. The heading contains the message originator, recipients, and
other service information. Each body part can contain a different form of data, and
messages can be nested within body parts.
P3 protocol. The X.400 message submission and delivery protocol, which defines a standard
for the submission and delivery of messages and the interaction of UAs and MTAs.
P7 protocol. The X.400 protocol defining access to the message store by remote or local user
agents.
package. A set of GPI object classes that are grouped together because they are functionally
related and defined in the same specification. For example, the MH 88 package consists
of the message handling classes defined in the XAPIA specification.
packet switching. A technique in which messages are broken into smaller units, called
“packets,” which can be individually addressed and routed through the network. The
receiving-end node ascertains that all the packets are received and in the proper
sequence before forwarding the complete message to the addressee.
PAM. See Port Access Method.
password server. An application process that provides security services at the MTA-MTA or
UA-MS boundary. Such an application uses either the MTA-bind or the MS-bind
password server interface of OSI/MHS. The master password server provided with
OSI/MHS is an example of a password server.