OSI/MHS Orientation Guide

Glossary
OSI/MHS Orientation Guide—424829-001
Glossary-27
Port Access Method (PAM)
TLAM (Tandem LAN access method). A Compaq product that implements the services of
the Data Link and Physical Layers for LANs.
Transaction Management Facility (TMF) subsystem. The major component of the NonStop
TM/MP product, which protects databases in online transaction processing
environments. To furnish this service, the TMF subsystem manages database
transactions, keeps track of database activity through audit trails, and provides database
recovery methods.
token. In DSM, a distinguishable unit in an SPI message. Programs place tokens in an SPI
buffer using the SSPUT or SSINIT procedures and retrieve them from the buffer using
the SSGET procedure. A token has two parts: an identifying code, or token code, and a
token value. In command and response messages, a token normally represents a
parameter to a command, an item of information in a response, or control information
for the subsystem. In event messages, a token normally represents an item of
information about an event or about the event message itself. See also header token.
token code. In DSM programmatic interfaces, a 32-bit value that identifies a token. A token
code consists of a token type (16 bits) and a token number (16 bits). See also token
number, token type, and token map.
token map. In DSM programmatic interfaces, a structure that contains decoding information
for a DSM extensible structured token. Also, a variable name that refers to an extensible
structured token. The token map includes a token code and a description of the token
value: its fields, the null values of those fields, and the versions of the fields. A token
map defines a structure that might change in some later code version (by the addition of
new fields at the end), and the information in the map allows SPI to provide
compatibility between different structure versions.
token number. In DSM programmatic interfaces, the number used by a subsystem to identify
each DSM token that it defines. The token type and the token number together form the
token code.
token type. In DSM programmatic interfaces, the part of a DSM token code that identifies the
data type and length of the token value. The token type and the token number together
form the token code.
token value. In DSM programmatic interfaces, the value assigned to a DSM token.
Transaction Monitoring Facility. See TMF.
Transfer. The Compaq proprietary messaging system, which supports communications
among people, input/output devices, and processes.
Transfer application. A set of processes that communicate with each other and with the
Transfer subsystem and work together to perform a common task.
Transfer X400 gateway. The application that allows Transfer correspondents to exchange
packages with users on other host systems that support the international X.400 message-
system standards.
transport address. See TSAP.