TS/MP Pathsend and Server Programming Manual (G06.24+, H06.03+)

Glossary
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Glossary-2
audited file
audited file. A database file that is flagged for auditing by the TMF subsystem; auditing is
the monitoring of transactions in preparation for recovery efforts.
audit trail. A record of database changes that can be used by the TMF subsystem to rebuild a
database in the event of a hardware or software failure. An audit trail is also known in
the industry as a transaction log.
availability. The amount of time an application running on a Tandem system can be used
effectively by a user of that application.
backup process. The member of a process pair that takes over the application work when the
primary process fails. See also primary process, process pair, and checkpoint message.
base screen. In SCREEN COBOL, a screen that occupies the entire physical display area of a
terminal and can be displayed independently of other screens. This type of screen can
contain areas on which overlay screens are displayed. See also screen and overlay
screen.
batch processing. A method of transaction processing in which transactions are first grouped
together and then processed at regular intervals. See also online transaction processing
(OLTP).
block mode. A terminal operating mode in which data is read from the terminal and
displayed on the terminal one screen at a time. See also conversational mode.
cache. A temporary storage buffer.
cascading server. A term formerly used for a nested server. See nested server.
checkpoint message. In the Guardian environment, a message sent by a primary process to
its backup process that keeps the backup process up to date on the state of the
application. A checkpoint message provides a snapshot of process activity that can be
used in the event of a takeover by a backup process to allow the backup process to
maintain fault-tolerant operation.
CISC. See complex instruction-set computing (CISC).
client. An application program that requests services to be performed. In discussions of the
Pathway environment, this term is used to refer to the part of an application that runs on
some other vendor’s hardware, such as a personal computer, Macintosh computer, UNIX
workstation, or mainframe computer system, and makes requests of a server process.
See also requester, server, and client/server model.
client/server model. A model for distributing applications. In general, but not always, in this
model the client process resides on a workstation and the server process resides on a
second workstation, minicomputer, or mainframe system. Communication takes the
form of request and reply pairs, which are initiated by the client and serviced by the
server. (A server can make requests of another server, thus acting as a client.)
Client/server computing is often used to connect different types of workstations or