About This Manual

This document provides a brief technical overview of the functionality in Digital UNIX ® Version 4.0.

Note
This book is in no way intended to supersede the Software Product Description (SPD), which is the definitive legal document describing the functionality in Digital UNIX Version 4.0 that Digital supports.

Audience

This manual is for anyone who is interested in the functionality in Digital UNIX Version 4.0.

Organization

This document contains the following chapters and appendixes:

Chapter 1 Introduction to Digital UNIX Version 4.0

Chapter 2 Symmetrical Multiprocessing

Chapter 3 Networking

Chapter 4 The File System Subsystem

Chapter 5 The Virtual Memory Subsystem

Chapter 6 The I/O Subsystem

Chapter 7 The Development Environment

Chapter 8 The Windowing Environment

Chapter 9 System V Functionality

Chapter 10 Internationalization

Chapter 11 Security

Chapter 12 Installation and System Setup

Chapter 13 System Administration

Appendix A Conformance to Internet Host Requirements

Related Documents

You should have access to the Software Product Description (SPD), the Systems and Options Catalog, and the entire Digital UNIX Version 4.0 documentation suite.

The printed version of the Digital UNIX documentation set is color coded to help specific audiences quickly find the books that meet their needs. (You can order the printed documentation from Digital.) This color coding is reinforced with the use of an icon on the spines of books. The following list describes this convention:

Audience Icon Color Code

General users G Blue

System and network administrators S Red

Programmers P Purple

Device driver writers D Orange

Reference page users R Green

Some books in the documentation set help meet the needs of several audiences. For example, the information in some system books is also used by programmers. Keep this in mind when searching for information on specific topics.

The Documentation Overview, Glossary, and Master Index provides information on all of the books in the Digital UNIX documentation set.

Reader's Comments

Digital welcomes any comments and suggestions you have on this and other Digital UNIX manuals.

You can send your comments in the following ways:

Fax: 603-881-0120 Attn: UEG Publications, ZK03-3/Y32
Internet electronic mail: readers_comment@zk3.dec.com
A Reader's Comment form is located on your system in the following location:
```
/usr/doc/readers_comment.txt
```
Mail:
Digital Equipment Corporation
UEG Publications Manager
ZK03-3/Y32
110 Spit Brook Road
Nashua, NH 03062-9987
A Reader's Comment form is located in the back of each printed manual. The form is postage paid if you mail it in the United States.

Please include the following information along with your comments:

The full title of the book and the order number. (The order number is printed on the title page of this book and on its back cover.)
The section numbers and page numbers of the information on which you are commenting.
The version of Digital UNIX that you are using.
If known, the type of processor that is running the Digital UNIX software.

The Digital UNIX Publications group cannot respond to system problems or technical support inquiries. Please address technical questions to your local system vendor or to the appropriate Digital technical support office. Information provided with the software media explains how to send problem reports to Digital.

Conventions

The following conventions are used in this guide:

%
$ A percent sign represents the C shell system prompt. A dollar sign represents the system prompt for the Bourne and Korn shells.

# A number sign represents the superuser prompt.

% cat Boldface type in interactive examples indicates typed user input.

file Italic (slanted) type indicates variable values, placeholders, and function argument names.

[ | ]
{ | } In syntax definitions, brackets indicate items that are optional and braces indicate items that are required. Vertical bars separating items inside brackets or braces indicate that you choose one item from among those listed.

. . . In syntax definitions, a horizontal ellipsis indicates that the preceding item can be repeated one or more times.

cat(1) A cross-reference to a reference page includes the appropriate section number in parentheses. For example, cat(1) indicates that you can find information on the cat command in Section 1 of the reference pages.

Mb/s This symbol indicates megabits per second.

MB/s This symbol indicates megabytes per second.

Ctrl/x This symbol indicates that you hold down the first named key while pressing the key or mouse button that follows the slash. In examples, this key combination is enclosed in a box (for example, [Ctrl/C]).

Chapter 1	Introduction to Digital UNIX Version 4.0
Chapter 2	Symmetrical Multiprocessing
Chapter 3	Networking
Chapter 4	The File System Subsystem
Chapter 5	The Virtual Memory Subsystem
Chapter 6	The I/O Subsystem
Chapter 7	The Development Environment
Chapter 8	The Windowing Environment
Chapter 9	System V Functionality
Chapter 10	Internationalization
Chapter 11	Security
Chapter 12	Installation and System Setup
Chapter 13	System Administration
Appendix A	Conformance to Internet Host Requirements

Audience	Icon	Color Code
General users	G	Blue
System and network administrators	S	Red
Programmers	P	Purple
Device driver writers	D	Orange
Reference page users	R	Green

`%` `$`	A percent sign represents the C shell system prompt. A dollar sign represents the system prompt for the Bourne and Korn shells.
`#`	A number sign represents the superuser prompt.
`%` `cat`	Boldface type in interactive examples indicates typed user input.
`file`	Italic (slanted) type indicates variable values, placeholders, and function argument names.
[ \| ] { \| }	In syntax definitions, brackets indicate items that are optional and braces indicate items that are required. Vertical bars separating items inside brackets or braces indicate that you choose one item from among those listed.
. . .	In syntax definitions, a horizontal ellipsis indicates that the preceding item can be repeated one or more times.
`cat`(1)	A cross-reference to a reference page includes the appropriate section number in parentheses. For example, `cat`(1) indicates that you can find information on the `cat` command in Section 1 of the reference pages.
Mb/s	This symbol indicates megabits per second.
MB/s	This symbol indicates megabytes per second.
Ctrl/x	This symbol indicates that you hold down the first named key while pressing the key or mouse button that follows the slash. In examples, this key combination is enclosed in a box (for example, `[Ctrl/C]`).