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+.\" ========================================================================
+.\"
+.IX Title "xpa n"
+.TH xpa n "July 23, 2013" "version 2.1.15" "SAORD Documentation"
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+\&\fB\s-1XPA:\s0 Public Access to Data and Algorithms\fR
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+This document is the Table of Contents for \s-1XPA\s0.
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+The \s-1XPA\s0 messaging system provides seamless communication between many
+kinds of Unix programs, including X programs and Tcl/Tk programs.  It
+also provides an easy way for users to communicate with XPA-enabled
+programs by executing \s-1XPA\s0 client commands in the shell or by utilizing
+such commands in scripts.  Because \s-1XPA\s0 works both at the programming
+level and the shell level, it is a powerful tool for unifying any
+analysis environment: users and programmers have great flexibility in
+choosing the best level or levels at which to access \s-1XPA\s0 services, and
+client access can be extended or modified easily at any time.
+.PP
+A program becomes an XPA-enabled server by defining named points of
+public access through which data and commands can be exchanged with
+other client programs (and users).  Using standard \s-1TCP\s0 sockets as a
+transport mechanism, \s-1XPA\s0 supports both single-point and broadcast
+messaging to and from these servers.  It supports direct communication
+between clients and servers, or indirect communication via an
+intermediate message bus emulation program. Host-based access control
+is implemented, as is as the ability to communicate with \s-1XPA\s0 servers
+across a network.
+.PP
+\&\s-1XPA\s0 implements a layered interface that is designed to be useful both
+to software developers and to users.  The interface consists of a
+library of \s-1XPA\s0 client and server routines for use in C/\*(C+ programs and
+a suite of high-level user programs built on top of these libraries.
+Using the \s-1XPA\s0 library, access points can be added to Tcl/Tk programs,
+Xt programs, or to Unix programs that use the \s-1XPA\s0 event loop or any
+event loop based on \fIselect()\fR.  Client access subroutines can be added
+to any Tcl/Tk, Xt, or Unix program. Client access also is supported at
+the command line via a suite of high-level programs.
+.PP
+Choose from the following topics:
+.IP "\(bu" 4
+Introduction to \s-1XPA\s0
+[xpaintro(n)]
+.IP "\(bu" 4
+Access Point Names and Templates
+[xpatemplate(n)]
+.IP "\(bu" 4
+Getting Common Information About Access Points
+[xpacommon(n)]
+.IP "\(bu" 4
+Communication Methods
+[xpamethod(n)]
+.IP "\(bu" 4
+Communication Between Hosts
+[xpainet(n)]
+.IP "\(bu" 4
+Distinguishing Users
+[xpausers(n)]
+.IP "\(bu" 4
+\&\s-1XPA\s0 User Programs
+.RS 4
+.IP "\(bu" 4
+xpaget: get data and info
+[\fIxpaget\fR\|(1)]
+.IP "\(bu" 4
+xpaset: send data and info
+[\fIxpaset\fR\|(1)]
+.IP "\(bu" 4
+xpainfo: send info alert
+[\fIxpainfo\fR\|(1)]
+.IP "\(bu" 4
+xpaaccess: get access point info
+[\fIxpaaccess\fR\|(1)]
+.IP "\(bu" 4
+xpamb: message bus emulation
+[\fIxpamb\fR\|(1)]
+.IP "\(bu" 4
+xpans: the \s-1XPA\s0 name server
+[\fIxpans\fR\|(1)]
+.RE
+.RS 4
+.RE
+.IP "\(bu" 4
+\&\s-1XPA\s0 Server Routines
+.RS 4
+.IP "\(bu" 4
+XPANew: define a new access point
+[\fIxpanew\fR\|(3)]
+.IP "\(bu" 4
+XPACmdNew: define a new command access point
+[\fIxpacmdnew\fR\|(3)]
+.IP "\(bu" 4
+XPACmdAdd: add a command
+[\fIxpacmdadd\fR\|(3)]
+.IP "\(bu" 4
+XPACmdDel: delete a command
+[\fIxpacmddel\fR\|(3)]
+.IP "\(bu" 4
+XPAInfoNew: define an info access point
+[\fIxpainfonew\fR\|(3)]
+.IP "\(bu" 4
+XPAFree: free an access point
+[\fIxpafree\fR\|(3)]
+.IP "\(bu" 4
+XPAMainLoop: event loop for select server
+[\fIxpamainloop\fR\|(3)]
+.IP "\(bu" 4
+XPAPoll: poll for \s-1XPA\s0 events
+[\fIxpapoll\fR\|(3)]
+.IP "\(bu" 4
+XPACleanup: release reserved \s-1XPA\s0 memory
+[\fIxpacleanup\fR\|(3)]
+.IP "\(bu" 4
+\&\s-1XPA\s0 Server Macros: accessing structure internals
+[\fIxpamacros\fR\|(3)]
+.IP "\(bu" 4
+\&\s-1XPA\s0 Race Conditions: how to avoid them
+[\fIxparace\fR\|(3)]
+.IP "\(bu" 4
+\&\s-1XPA\s0 Out of Memory (\s-1OOM\s0) errors
+[\fIxpaoom\fR\|(3)]
+.RE
+.RS 4
+.RE
+.IP "\(bu" 4
+\&\s-1XPA\s0 Client Routines
+.RS 4
+.IP "\(bu" 4
+XPAOpen: open a persistent client connection
+[\fIxpaopen\fR\|(3)]
+.IP "\(bu" 4
+XPAClose: close persistent client connection
+[\fIxpaclose\fR\|(3)]
+.IP "\(bu" 4
+XPAGet: get data
+[\fIxpaget\fR\|(3)]
+.IP "\(bu" 4
+XPASet: send data or commands
+[\fIxpaset\fR\|(3)]
+.IP "\(bu" 4
+XPAInfo: send an info alert
+[\fIxpainfo\fR\|(3)]
+.IP "\(bu" 4
+XPAGetFd: get data and write to an fd
+[\fIxpagetfd\fR\|(3)]
+.IP "\(bu" 4
+XPASetFd: read data from and fd and send
+[\fIxpasetfd\fR\|(3)]
+.IP "\(bu" 4
+XPANSLookup: look up an access point
+[\fIxpanslookup\fR\|(3)]
+.IP "\(bu" 4
+XPAAccess: get access info
+[\fIxpaaccess\fR\|(3)]
+.IP "\(bu" 4
+The XPA/Xt Interface: Xt interface to \s-1XPA\s0
+[xpaxt(n)]
+.IP "\(bu" 4
+The XPA/Tcl Interface: Tcl interface to \s-1XPA\s0
+[xpatcl(n)]
+.RE
+.RS 4
+.RE
+.IP "\(bu" 4
+Tailoring the \s-1XPA\s0 Environment
+.RS 4
+.IP "\(bu" 4
+Environment Variables
+[xpaenv(n)]
+.IP "\(bu" 4
+Access Control
+[xpaacl(n)]
+.RE
+.RS 4
+.RE
+.IP "\(bu" 4
+Miscellaneous
+.RS 4
+.IP "\(bu" 4
+Where to Find Example/Test Code
+.IP "\(bu" 4
+User Changes Between \s-1XPA\s0 1.0 and 2.0
+.IP "\(bu" 4
+\&\s-1API\s0 Changes Between \s-1XPA\s0 1.0 and 2.0
+.IP "\(bu" 4
+What Does \s-1XPA\s0 Stand For, Anyway?
+.RE
+.RS 4
+.RE