OSI/MHS P7 Application Programmatic Interface (P7 API) Manual

Glossary

OSI/MHS P7 Application Programmatic Interface (P7 API) Manual—424825-001

Glossary-5

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.

control and inquiry. In DSM, those operations that affect or request information about the

state or configuration of an object. See also event management.

core services. The portion of the operating system that consists of the low-level functions,

including interprocess communication, I/O interface procedures, and memory, time, and

process management.

correspondent. A sender or receiver of information within the Transfer subsystem.

Examples of possible types of correspondents are a person, an interest group, a process,

or a device.

critical event. A DSM event that is 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. See also noncritical event.

CUG (closed user group). A set of users who may communicate with one another. Closed

user groups are an optional feature of OSI/MHS and are not part of the X.400

recommendations; when CUGs are established, users may communicate with one

another only if both are part of the same CUG.

CUG object. An object type, used in OSI/MHS management interfaces, that identifies a

closed user group to the Compaq OSI/MHS subsystem.

CUGMEMBER object. An object type, used in OSI/MHS management interfaces, that

identifies an individual member of a closed user group.

data communications standard definitions. In DSM, the set of declarations provided by

Compaq for use in all management applications that manage or retrieve event messages

from Compaq data communications subsystems. The names of these definitions start

with either ZCOM or ZCMK. See also definition files, SPI standard definitions, or EMS

standard definitions.

Data Link Layer. Layer 2 in the OSI Reference Model. This layer packages data for

transmission across the physical link and ensures that the data arrives at the next layer

without any errors.

data list. In DSM programmatic interfaces, a group of tokens used to separate response

records within an SPI message for a response, or 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.

decoding. The process of changing ASN.1 encoded (BER) data into a local representation.