TCP/IPv6 Migration Guide

Glossary
HP NonStop TCP/IPv6 Migration Guide—524524-004
Glossary-4
context token
context token. In DSM programmatic interfaces, a token in an SPI response message that
indicates (by its presence or absence) whether or not the response is continued in the
following message. If this token is present, the response is continued. To obtain the
next message, the application program reissues the original command with one
modification: the context token is included in the new command message. When the
subsystem sends a response message that does not contain a context token, the
series of response messages is complete.
control and inquiry. In DSM, those aspects of object management that affect the state or
configuration of an object, such as inquiries about the object and commands pertaining
to the environment (for example, commands that set default values for the session).
Compare event management.
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.
CSMA (Carrier Sense Multiple Access). A characteristic of network hardware that
operates by allowing multiple stations to contend for access to a transmission medium
by listening to see if it is idle.
CSMA/CD (Carrier Sense Multiple Access with Collision Detection). A characteristic of
network hardware that uses CSMA access combined with a mechanism that allows the
hardware to detect when two stations simultaneously attempt transmission. Ethernet is
an example of a well-known network based on CSMA/CD technology.
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
HP 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.