TCP/IP Configuration and Management Manual

Glossary
TCP/IP Configuration and Management Manual—427132-004
Glossary-3
connection
connection. The path between two protocol modules that provides reliable stream delivery
service. In the Internet, a connection extends from a TCP module on one machine to a
TCP module on another machine.
connectionless service. Characteristic of the packet delivery service offered by most
hardware and by the Internet Protocol (IP). The connectionless service treats each
packet or datagram as a separate entity that contains the source and destination
address. Usually, connectionless services can drop packets or deliver them out of
sequence.
critical event. A DSM event that is considered to be crucial to the operation of the system
or network. Each subsystem determines which of its events are critical, designating
them as such by setting the value of the emphasis token to TRUE. Compare
noncritical
event.
DARPA (Defense Advanced Projects Research Agency). Formerly called ARPA. The
government agency that funded research and experimentation with the ARPANET and
DARPA Internet.
data communications standard definitions. In DSM, the set of declarations provided by
HP for use in all management programs that manage or retrieve event messages from
NonStop data communications subsystems. The names of these definitions start with
either ZCOM or ZCMK. See also definition
or definition files. Compare SPI standard
definitions or EMS standard definitions.
data list. In DSM programmatic interfaces, a group of tokens used to separate response
records within an SPI message for a response, or used to enclose a single response
record, if the program so requests. A data list consists of a list token that denotes a
data list (different from the token that starts an error list or a generic list), followed by a
response record and an end-list token. See also response record
.
DDN (Defense Data Network). Used to loosely refer to the MILNET, 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. 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.