IPX/SPX Programming Manual

Glossary
HP NonStop IPX/SPX Programming Manual—528022-001
Glossary-3
DARPA (Defense Advanced Projects Research
Agency)
DARPA (Defense Advanced Projects Research Agency). The government agency that
funded research and experimentation with the ARPANET and DARPA Internet.
Formerly called ARPA.
DDN (Defense Data Network). Used to loosely refer to the MILNET and ARPANET and
the TCP/IP protocols they use. More literally, it is the MILNET and associated parts of
the Internet that connect military installations.
definition files. A set of files containing declarations for use in applications that call SPI
procedures. SPI has a standard definition file for 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. The interface that
allows an application or another process to communicate with data communications
hardware.
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.
Distributed Systems Management. See DSM.
distributor. An EMS process that distributes event messages from event logs to requesting
management applications, to NonStop Kernel console message destinations, or to a
collector on another node. See also consumer distributor and compatibility distributor.
DNS (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 Name Server. See DNS (Domain Name Server).
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. (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.
ECHO. The name of a program used in the Internet to test reachability of destinations by
sending them an ICMP echo request and waiting for a reply.