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File No. 5370-20
Order No GC28-2003-6

IBM Time Sharing System
Systems Concepts and Facilities

This publication provides an introductIOn to the IBM Time
Sharing System (!SS), a general purpose ooeratlng
system used with IBM System/370 computers that have
dynamic address translation. TSS allows many users to
'lave simultaneous access to a computing system The
combination of machine and control program creates a
data processing environment for each user which can be
'Jtillzed Independently or shared with other users. Each
user operates In a separate virtual address space poten-
tially as big as the addressing capability of the machine

rhe design of TSS facilitates program development
because the functions prOVided support a convenient,
Interactive programming environment Programs devel-
oped In thiS environment may be used In production
mode Without change Integration of virtual storage with
data management pe"mlts an Innovative and productive
approach to data base applications. A feature of TSS IS
user ownersh,p of data With security and privacy.

This publication is wntten for managers of data process-
ing Installations, system programmers, application
programmers, end users of applications. and operators.
11 IS an introduction to the purpose, design, and use of
TSS. It contaH1S general descriptions of the control
program, task management, and data management; a
summary of publ1ca1l0ns relating to TSS; and Information
about use of the system to support indiVidual users and
subsystem development proJects.

There is no prerequisite reading for this publication
However, the reader should have a basic understanding
of IBM data processing techniques.

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Summary of Amendments
Changes since the last edition (GC28-2003-5) include: