MPE/iX Glossary of Terms and Acronyms (32650-90887)

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Glossary of Terms
MPEXL_SYSTEM_VOLUME_SET. This is equivalent to an MPE V/E
system domain.
tape mark The uniquely formatted area on a magnetic tape that is used to separate
files; it also may be used to delimit the end of the tape (two file or tape
marks).
tape request A printed message at the console asking for a backup device to be assigned
to a user.
temporary file A file that exists only for the duration of a session or job.
terminal A hardware device connected to a computer, used for entering and
receiving data. A terminal consists of a keyboard and a display screen.
Text and Document Processor/V (TDP/V) An HP 3000 line editor (with a screen
editor option) used to create, manipulate, and format ASCII text files.
thermal printer A printer that forms characters by heating paper. The printer requires
special heat-sensitive paper.
ThickLAN cables ThickLAN cables (IEEE802.3 10BASE5) are used to connect
Datacommunications and Terminal Controllers (DTCs) to the system.
Thicknet cables require a media attachment unit (MAU) for each DTC.
Use of ThickLAN cabling is most appropriate when the DTCs are
distributed throughout the facility.
ThinLAN cables ThinLAN cables (IEEE802.3 10BASE2) are used to connect
Datacommunications and Terminal Controllers (DTCs) to the system. Use
of ThinLAN cabling is most appropriate when the DTCs are in close
proximity to the system.
throughput A measurement of the amount of useful work performed by a system in a
given amount of time.
Toolset/XL Toolset/XL provides an integrated programming environment for COBOL
II/XL and Pascal/iX programming.
topology The physical structure of a network (for example, star or ring network).
track A data area on disk that forms a concentric circle, divided into sectors. One
full track passes under the disk head during each rotation of the disk.
trailer The last page printed every time output is directed to a line printer. It
contains the session number, session name, logon identification, day of the
week, date, and time. It corresponds to the header printed as the first
page.
TRANSACT A high-level programming language for MPE V and MPE/iX.
transaction A logical unit of work. It may consist of one or more operations, but either
all or none of them will be performed.
transaction logging The process of keeping track of all database operations occurring
within defined transactions. The resulting transaction log file can be used
to recover data and ensure database integrity when a program aborts or
the system crashes.