TS/MP System Management Manual (G06.24+, H06.03+)

Glossary
NonStop TS/MP System Management Manual—541819-001
Glossary-21
requester
indicates whether the request was processed successfully and whether the reply
contains data returned by the application service. See also request translation header.
requester. 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 requester program that is interpreted by the terminal
control process (TCP), which provides link access to Pathway server classes. Another
type of requester program makes requests through Pathsend procedure calls; such a
requester uses the LINKMON process for link access to server classes. A third type of
requester communicates with server processes directly by calling the Guardian
WRITEREAD procedure; this kind of requester does not use server classes. A
requester is a specific type of client. See also client, server, and requester/server
model.
requester/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:
requesters and servers. A requester sends a request to a server. The server takes the
requested action and then replies to the requester. The requester 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 requester and
server.
request message. The part of an interprocess communication message that is formatted by
a requester 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/response server. See context-free server.
request translation header. A group of header fields that must be included at the
beginning of each request message a SCREEN COBOL or Pathsend requester 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.
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.