TCP/IPv6 Migration Guide

Glossary
HP NonStop TCP/IPv6 Migration Guide—524524-004
Glossary-5
definition
definition. One of the declarations provided by HP for use in applications that call APS or
SPI procedures. These definitions are provided in definition files. See also definition
files.
definition files. A set of files containing declarations for use in applications that call SPI
procedures. SPI has a standard definition file for the Data Definition Language (DDL)
and one for each of the programming languages supporting SPI; the latter files are
derived from the DDL definition file. Likewise, each subsystem that has a token-
oriented programmatic interface has one definition file for DDL and one for each
programming language. Some subsystems—for instance, data communications
subsystems—have additional, shared definition files. See also SPI standard definitions,
data communications standard definitions, or EMS standard definitions.
deprecated address. An address assigned to an interface whose use is discouraged, but
not forbidden. A deprecated address should no longer be used as a source address in
new communications, but packets sent from or to deprecated addresses are delivered
as expected. A deprecated address may continue to be used as a source address in
communications where switching to a preferred address causes hardship to a specific
upper-layer activity (for example, an existing TCP connection).
Distributed Systems Management. A set of tools used to manage NonStop systems and
EXPAND networks. These tools include the VIEWPOINT console application, 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 token-oriented programmatic interfaces to the
management processes for various HP subsystems.
distributor. An EMS process that distributes event messages from event logs to requesting
management applications, to Guardian console message destinations, or to a collector
on another node. See also consumer distributor. and compatibility distributor. Contrast
collector.
DNS (Domain Name Server). See Domain Name Server
.
Domain Name Server. A method for naming resources. The basic function of the domain
name server is to provide information about network objects by answering queries.
Domain. In the Internet, a part of the naming hierarchy. Syntactically, a domain name
consists of a sequence of names (labels) separated by periods (dots).
DSM. See Distributed Systems Management
.
DUAL Mode. An operating mode of NonStop TCP/IPv6 in which the subsystem supports
both IPv4 and IPv6 addressing. See also INET6 Mode and INET Mode.
Dual stack. A node that supports both IPv4 and IPv6.
E4SA. See Ethernet 4 ServerNet adapter (E4SA).