CORBA 2.6.1 Glossary

default behavior for objects as specified by the root POA.
stateless processing
A style of application logic in which operations directed to the same object can result in requests to
different servants, which in turn can reside in different processes in a server pool. A stateless
object cannot maintain state information in memory between operations, because the state
information would be available to only one process. A client reference can address any of a set of
instances. Stateless objects are accessible only when hosted in a server pool. Stateless processing
is selected by using a lifespan policy of PERSISTENT (or by setting the NonStop CORBA
proprietary state policy to STATELESS) for the POA that creates the object reference, and by
enabling the GIOP over TS/MP protocol in the server.
Static Invocation Interface (SII)
A request style in which the client must know the object interface (the calling sequence for
requesting specific operations) at compile time. Contrast Dynamic Invocation Interface.
Structured Query Language (SQL)
A standard technology for defining and using relational databases. NonStop SQL/MP is an HP
implementation of this standard.
subclass
An object class that inherits characteristics from another object class.
subnet
A concept that applies to TCP/IP, which defines the relationship between a TCP/IP process, one or
more TLAM processes, and one or more Internet (IP) addresses.
Subsystem Control Facility (SCF)
The interactive utility for configuring, monitoring, and controlling networking resources on a
NonStop system.
Subsystem Programmatic Interface (SPI)
A set of conventions that provide a uniform way to automate the management of many products on
a NonStop system. In general, a management programming interface based on SPI makes available
the same set of services available to an operator through the corresponding interactive utility. For
example, NonStop TS/MP offers a management programming interface that gives applications
access to the same set of functions available through PATHCOM.
TCP/IP (Transmission Control Protocol/Internet Protocol)
One of the most widespread networking protocols, the basis for communications on the Internet.
The CORBA IIOP protocol uses TCP/IP as its transport service. NonStop TCP/IP is the HP
product that implements TCP/IP on NonStop systems.
thread
The basic unit of program execution. A process can have several threads running concurrently,
each performing a different job, such as waiting for events or performing a time-consuming job
that the program doesn't need to complete before going on. When a thread has finished its job, the