IBM OS/390 - page 601

routines. They can run on different computers with

little or no modification.

PDS. partitioned data set. A data set in direct access

storage that is divided into partitions, called

members, each of which can contain a program, part

of a program, or data. Contrast with sequential data

set.

PDSE. partitioned data set extended. A

system-managed data set that contains an indexed

directory and members that are similar to the

directory and members of partitioned data sets. A

PDSE can be used instead of a partitioned data set.

peer. (1) In network architecture, any functional unit

that is in the same layer as another entity. (2) A

corresponding node or entity.

physical IOCS (PIOCS). Supervisory routines that

schedule and supervise the execution of channel

programs. Physical IOCS controls the actual transfer

of records between external storage and main

storage, and provides I/O device error recovery.

physical record. (1) A record whose characteristics

depend on the manner or form in which it is stored,

retrieved, or moved. A physical record may contain

all or part of one or more logical records. (2) The

amount of data transferred to or from auxiliary

storage. Synonymous with block.

portability. (1) The capability of a program to be

executed on various types of data processing systems

without converting it to a different language and with

little or no modification. (2) The ability to run a

program on more than one computer without

modifying it. (3) Synonymous with transportability.

POWER. A VSE program used to spool input and

output. It also allows exchange of files with, or job

runs on, a remote processor Originally an acronym

for Priority Output Writer Execution and Reader.

procedure. A named block of code that can be

invoked, usually via a call.

PR/SM. Processor Resource / Systems Manager

precompile. To process programs containing SQL

statements before they are compiled. SQL statements

are replaced with statements that will be recognized

by the host language compiler. The output from this

precompile includes source code that can be

submitted to the compiler and used in the bind

process.

preventive maintenance. (1) Maintenance performed

specifically to prevent faults from occurring. (2)

Contrast with corrective maintenance.

private address space. An address space assigned to

a particular user.

problem determination. The process of determining

the source of a problem; for example, a program

component, machine failure, telecommunication

facilities, user or contractor-installed programs or

equipment, environmental failure such as a power

loss, or user error.

procedural language. A programming language in

which computations are expressed in terms of

statement sequences; for example, Pascal. Synonym

for procedure-oriented language.

procedure. In a programming language, a block, with

or without formal parameters, whose execution is

invoked by means of a procedure call.

procedure library. A program library in direct access

storage with job definitions. The reader/interpreter

can be directed to read and interpret a particular job

definition by an execute statement in the input

stream.

processor storage. (1) The storage provided by one

or more processing units. (2) In virtual storage

systems, synonymous with real storage.

PROCLIB. procedure library. A program library in

direct access storage with job definitions. The

reader/interpreter can be directed to read and

interpret a particular job definition by an execute

statement in the input stream.

program. A sequence of instructions suitable for

processing by a computer. Processing may include

the use of an assembler, a compiler, an interpreter, or

a translator to prepare the program for execution, as

well as to execute it.

program offering. An unwarranted licensed program.