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+.\" Copyright (c) 1986, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)0.t	8.1 (Berkeley) 6/8/93
+.\"
+.EH 'PSD:21-%''Advanced 4.4BSD IPC Tutorial'
+.OH 'Advanced 4.4BSD IPC Tutorial''PSD:21-%'
+.ds lq ``
+.ds rq ''
+.de DT
+.if t .ta .5i 1.25i 2.5i 3.75i
+.\" 3.5i went to 3.8i
+.if n .ta .7i 1.75i 3.8i 
+..
+.bd S B 3
+.TL
+An Advanced 4.4BSD Interprocess Communication Tutorial
+.AU
+Samuel J. Leffler
+.AU
+Robert S. Fabry
+.AU
+William N. Joy
+.AU
+Phil Lapsley
+.AI
+Computer Systems Research Group
+Department of Electrical Engineering and Computer Science
+University of California, Berkeley
+Berkeley, California  94720
+.sp 2
+.AU
+Steve Miller
+.AU
+Chris Torek
+.AI
+Heterogeneous Systems Laboratory
+Department of Computer Science
+University of Maryland, College Park
+College Park, Maryland 20742
+.de IR
+\fI\\$1\fP\\$2
+..
+.de UX
+UNIX\\$1
+..
+.AB
+.PP
+.FS
+* \s-2UNIX\s0 is a trademark of UNIX System Laboratories, Inc.
+in the US and some other countries.
+.FE
+This document provides an introduction to the interprocess
+communication facilities included in the
+4.4BSD release of the
+.UX *
+system.
+.PP
+It discusses the overall model for interprocess communication
+and introduces the interprocess communication primitives
+which have been added to the system.  The majority of the
+document considers the use of these primitives in developing
+applications.  The reader is expected to be familiar with
+the C programming language as all examples are written in C.
+.AE