SNAX/XF and SNAX/APN Event Management Programming Manual

Glossary
SNAX/XF and SNAX/APN Event Management Programming Manual—426859-001
Glossary-12
NonStop™
NonStop™. On Compaq NonStop™ systems, processing characterized by continued
operation even when a component fails, when equipment is being repaired or replaced,
or while new processors or peripheral devices are being added to the system.
nonswitched line. A telecommunication line on which connections do not have to be
established by dialing. Also called leased line. Contrast with switched line.
null value. A value indicating that a program has made no explicit assignment to a variable
or field. In DSM programmatic interfaces, a field of a structure has a null value if the
application has made no explicit assignment to that field after calling the SSNULL
procedure to initialize the structure.
OBEY file. A command file containing SCF commands. See command file
.
object. A Compaq resource as identified to DSM that can be configured, controlled, and
inquired about by the operator. The objects identified for SNAX products include
subsystems, lines, PUs, LUs, and applications.
object code. A compiled program, ready to be executed.
object-name token. A parameter or response token that identifies, by name, a particular
object of a given object type.
object state. As defined by SCF or SPI, one of the generally defined possible conditions of
an object with respect to the management of that object.
operator message. A message displayed at the operator console. A message may be an
informational, warning, error, or event message.
OSI. Open Systems Interconnection.
packet-switching data network. A network that uses packet switching as a means of
transmitting data.
passthrough. A function of the SNAX/XF line access software that allows a 3270 terminal
attached to a Compaq system to switch between Compaq and IBM applications.
Passthrough lets a host application program communicate with SNA devices connected
to a Compaq system as though the devices were connected to a cluster controller.
Passthrough is enabled by configuration and startup procedures; it is never directly
invoked by application software. Passthrough can also be used to perform service or
management tasks that are incidental to SNA applications on a Compaq system.
passthrough logical unit. A gateway LU that has been configured to provide the passthrough
function.
path information unit (PIU). A message unit consisting of a transmission header (TH)
alone, or of a TH followed by a basic information unit (BIU) or a BIU segment.