SNAX/XF and SNAX/APN Event Management Programming Manual

Glossary
SNAX/XF and SNAX/APN Event Management Programming Manual—426859-001
Glossary-19
Systems Network Architecture (SNA)
Systems Network Architecture (SNA). A description of the logical structure, formats,
protocols, and operational sequences for transmitting information units through, and
controlling the configuration and operation of, networks.
system services control point (SSCP). The focal point within an SNA network for managing
the configuration, coordinating network operator and problem determination requests,
and providing directory support and other session services for the users of the network.
Multiple SSCPs, cooperating as peers, can divide the network into domains of control,
with each SSCP having a hierarchical control relationship to the PUs and LUs within its
domain.
TACL. See Tandem Advanced Command Language (TACL)
.
TAL. Transaction Application Language.
Tandem Advanced Command Language (TACL). A Compaq product that provides the
user interface to the Guardian environment. SCF is started from the TACL command
interpreter.
Tandem Logon Manager for IBM Systems (ILOGMGR). Compaq software that runs in
IBM systems to support device logon using the SNAX/APN extended logon facility. See
also SNAX/APN logon manager (TLOGMGR)
.
template LU. An LU that is added using SCF like standard LUs but is never opened by
applications. A template LU is added for each and every CRT or ITI application that will
be logged onto by devices in the IBM network when the SNAX/APN enhanced logon
facility (ELF) is used. When ELF receives a logon request for a CRT or ITI application,
it uses the information in that application’s template LU to build and dynamically add an
LU for the requested session.
timestamp. A value indicating the date and time that something occurred (for example, the
most recent time a file was modified).
timestamp. A value indicating the date and time that something occurred (for example, the
most recent time a file was modified).
token. In the context of SPI, 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 with 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.
In the context of networking protocols, a sequence of three bytes passed from node to
node along the network. The middle field contains a token bit that indicates to a
receiving node that the token is available to accept information. If that node has data to
transmit, it appends that data to the token and changes the value of the bit. The token
now becomes a frame.