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    1 This is the directory for XPA 2.0.
    3 The XPA messaging system provides seamless communication between many
    4 kinds of Unix programs, including X programs and Tcl/Tk programs.  It
    5 also provides an easy way for users to communicate with XPA-enabled
    6 programs by executing XPA client commands in the shell or by utilizing
    7 such commands in scripts.  Because XPA works both at the programming
    8 level and the shell level, it is a powerful tool for unifying any
    9 analysis environment: users and programmers have great flexibility in
   10 choosing the best level or levels at which to access XPA services, and
   11 client access can be extended or modified easily at any time.
   13 A program becomes an XPA-enabled server by defining named points of
   14 public access through which data and commands can be exchanged with
   15 other client programs (and users).  Using standard TCP sockets as a
   16 transport mechanism, XPA supports both single-point and broadcast
   17 messaging to and from these servers.  It supports direct communication
   18 between clients and servers, or indirect communication via an
   19 intermediate message bus emulation program. Host-based access control
   20 is implemented, as is as the ability to communicate with XPA servers
   21 across a network.
   23 XPA implements a layered interface that is designed to be useful both
   24 to software developers and to users.  The interface consists of a
   25 library of XPA client and server routines for use in C/C++ programs and
   26 a suite of high-level user programs built on top of these libraries.
   27 Using the XPA library, access points can be added to Tcl/Tk programs,
   28 Xt programs, or to Unix programs that use the XPA event loop or any
   29 event loop based on select().  Client access subroutines can be added
   30 to any Tcl/Tk, Xt, or Unix program. Client access also is supported at
   31 the command line via a suite of high-level programs.
   33 To build XPA, see the INSTALL instructions (which are based on
   34 standard instructions for building software using GNU configure).
   36 Documentation for XPA is contained in the doc subdirectory (where the
   37 help.html file is the top-level index).
   39 If you have questions, please contact us at: saord@cfa.harvard.edu.
   41 							Eric Mandel
   43 XPA is distributed under the terms of The MIT License.