TS/MP 2.5 System Management Manual

COBOL or Pathsend requestor. This header indicates whether the request was processed
successfully and whether the reply contains data returned by the application service. See also
request translation header.
request message The part of an interprocess communication message that is formatted by a requestor and sent to
a specific server. The message contains any data and instructions needed by the server to perform
its processing. See also reply message.
request translation
header
A group of header fields that must be included at the beginning of each request message a
SCREEN COBOL or Pathsend requestor sends to the Pathway translation server for the NonStop
TUXEDO system. This header specifies the NonStop TUXEDO application service for which the
message is destined, the NonStop TUXEDO buffer types of the request and reply messages as
seen by the service, and options that modify the invocation of the service. The translation server
removes this header from the request message before sending it to the application service. See
also reply translation header
request/response
server
See context-free server.
requestor A process or program that runs in the Guardian environment on a Tandem NonStop system and
requests services from a server process. For example, a SCREEN COBOL program is a requestor
program that is interpreted by the terminal control process (TCP), which provides link access to
Pathway server classes. Another type of requestor program makes requests through Pathsend
procedure calls; such a requestor uses the ACS subsystem process for link access to server classes.
A third type of requestor communicates with server processes directly by calling the Guardian
WRITEREAD procedure; this kind of requestor does not use server classes. A requestor is a specific
type of client. See also client, server, and requestor/server model.
requestor/server
model
A model for application design that divides the tasks of data input, data manipulation, and data
output between two basic types of process: requestors and servers. A requestor sends a request
to a server. The server takes the requested action and then replies to the requestor. The requestor
and server may reside on the same processor or on different processors. This model is used for
interprocess communication in the Guardian environment. See also requestor and server.
reserved word A word that can be used only as a keyword.
resources The components of a computer system that work together to process transactions. Terminals,
workstations, CPUs, memory, I/O controllers, disk drives, processes, files, and applications are
examples of resources.
response time The amount of time it takes to receive a response from the system after initiating a request message
(for example, by pressing a function key).
retryable operation An operation that can be interrupted and repeated an indefinite number of times without affecting
the consistency of the database; for example, all read operations are retryable.
RISC See reduced instruction-set computing (RISC).
root directory An OSS directory associated with a process that the system uses for pathname resolution when
a pathname begins with a slash (/) character. See also OSS pathname.
ROUT Redirector (RD) processes that provide LINKMON-like functionality to Pathsend requestors. ROUT
is also referred to as RD process.
NOTE: The RD is part of the ACS subsystem.
RSC See Remote Server Call (RSC).
scalability The ability to increase the size and processing power of an online transaction processing system
by adding processors and devices to a system, systems to a network, and so on, and to do so
easily and transparently without bringing systems down. Scalability is also sometimes called
expandability.
SCOBOLX The object file for the SCREEN COBOL compiler program. This name is given in a TACL command
to invoke the compiler. See also SCREEN COBOL.
screen A group of data fields that represent formatted data to be displayed on a terminal. A screen is
defined by a screen description entry in the Screen Section of a SCREEN COBOL program. There
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