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+.NC "Introduction"
+.sh 1 "Introduction"
+.pp
+This document describes the usage of the ISO
+transport and network layers written for the ACIS Operating System,
+the IBM ACIS port of Berkeley 4.3 Unix\**
+.(f
+\** Unix is a registered trademark of AT&T.
+.)f
+for the IBM RT PC,
+hereafter called AOS, as modified by UC Berkeley.
+This document describes work in progress and is an extremely
+hasty job of editing an earlier document written by colleagues
+at the university of Wisconsin.
+It is to be regarded as an emergency manual prepared for testers
+at NIST and should not be redistributed further.
+As such, there are philosophical
+statements that Berkeley fundamentally disagrees with, which
+we do not presently have the time to rip out.
+Collectively, this work is called the Wisconsin ARGO kernel. 
+The ARGO kernel supports the 
+the connection-oriented ISO transport service (COTS), the
+ISO connectionless network service (CLNS)
+and a
+connection-oriented network service (CONS).
+The COTS is provided by the ISO transport protocol TP,
+ISO 8073 Revised.
+The CLNS is provided by the connectionless network protocol,
+ISO 8473.
+The CONS is provided by the X.25 protocols.
+The ARGO implementation of the CONS is not a complete
+ISO CONS, but contains enough of the CONS to support
+the COTS and the CLNS (in the latter case, the CONS can be
+viewed as a subnetwork service).
+.pp
+The purposes of this document are
+.ip "1) "
+to describe the transport service and the software interface
+between the user and provider of this service,
+.ip "2) "
+to describe the network service and the software interface it
+provides.
+.pp
+It is assumed that the reader is familiar with the \fBC\fR
+programming language,
+with Unix conventions, and with the ISO specifications listed in Appendix A.
+.sh 1 "Organization"
+.pp
+This document is composed of several chapters.
+Chapter One contains this introduction. Chapter Two presents a
+definition of terms and phrases used throughout the document.
+Chapter Three describes the transport service interface, which is
+the interface between the transport protocol implementation software and the transport user software.
+Chapter Four describes the network service interface, and the interface
+above and below the network layer.
+Chapter Five explains the format of an OSI address.
+Chapter Six describes the
+the architecture of the interprocess communication support in the 
+kernel, which to a large degree mandates
+the design of a protocol implementation for a 4.3 Unix kernel.
+.\" Appendix A is a list of the applicable ISO standards.
+.\" The manual pages relevant to the transport and network layers
+.\" are included as Appendix B.
+.pp
+Several conventions are followed in this document.
+All procedure names and system call names are followed
+by a pair of parentheses, for example,
+.i read ().
+References to manual pages consist of the name of the
+manual page, followed by the section in which
+the man page is found:
+.i read (2).