Availability Guide for Application Design

Glossary
Availability Guide for Application Design—525637-004
Glossary-26
updating state information
updating state information. The act of passing control-state information and data-state
information to the backup process of an active backup process pair. Contrast with
checkpoint. See also control-state information and data-state information.
up state. An object that meets all its operational objectives and can be used by the
application to provide service. See also down state, odd state, and unknown state.
variable procedure. A procedure to which a user can add formal parameters but then must
recompile all its callers. The compiler considers all parameters of this procedure to be
optional, even if some are required by the user’s code. See also extensible procedure.
version label. A tag that identifies the revision level of an application module and assists in
negotiating communication between application modules that are at different revision
levels.
ViewPoint. A management application that lets you control a system or network from a
single terminal.
ViewSys. An interactive utility that monitors system resources while the system is running.
volume recovery. A NonStop Transaction Management/MP (TMF) feature for restoring
logically inconsistent disk files to their most recent consistent state. Volume recovery
uses audit-trail files. See also file recovery.
WSH. See workstation handler (WSH).
WSL. See workstation listener (WSL).
workstation handler (WSH). The surrogate client supplied by System /T responsible for
managing a set of workstation client connections. These handlers are started
dynamically by the workstation listener. The handler may be customized if necessary.
workstation listener (WSL). The process responsible supplied by System /T for acting as
the single point of contact for the workstation client. The workstation listener also
handles the distribution of workstation connections to workstation handlers, starting
new handlers as necessary.
\WS. The software component included with the NonStop Tuxedo system to support
workstation clients.
X/Open. A consortium of UNIX vendors who are defining portability standards for the UNIX
environment.
X/Open Distributed Transaction Processing (X/Open DTP). A distributed transaction-
processing architecture for a two-phased commit protocol. The architecture defines
application programming interfaces and interactions among transactional applications,
transaction managers, resource managers, and communications managers.
X/Open DTP. See X/Open Distributed Transaction Processing (X/Open DTP).