Extended Tcl (TclX) 8.4.0
                          =========================

INTRODUCTION
============

Extended Tcl (TclX), is an extension to Tcl, the Tool Command Language
invented by Dr. John Ousterhout.  Tcl is a powerful, yet simple embeddable
programming language.  Extended Tcl is oriented towards system programming
tasks and large application development.  TclX provides additional
interfaces to the operating system, and adds many new programming
constructs, text manipulation tools, and debugging tools.

TclX is upwardly compatible with Tcl.  You take the Extended Tcl package,
add it to Tcl, and from that you get Extended Tcl.  Tcl can be obtained at
    http://tcl.sourceforge.net/ or http://www.tcl.tk/

Extended Tcl runs on most Unix-like systems and Windows.

While this TclX distribution is tested with Tcl 8.3 and Tk 8.3, it will
probably work with newer versions of 8.3.*-series Tcl & Tk with little or
no changes.  Please check the Extended Tcl homepage at
    http://www.neosoft.com/tclx/ or http://tclx.sourceforge.net/
for the latest release and information.

Extended Tcl was designed and implemented by Karl Lehenbauer
(karl@procplace.com) and Mark Diekhans (markd@Kermodei.com), with help in
the earliest stages from Peter da Silva (peter@NeoSoft.com).  TclX 8.4
work was done by Jeff Hobbs.

TclX 8.4 differs from its predecessors in that it is based more on the
idea of TclX as an extension to Tcl, and not an alternate environment.
There is no TkX and no stand-alone shells are built.

As with Tcl, all of Extended Tcl is freely redistributable, including for
commercial use and resale (BSD-style license).

BUILDING TCLX
=============

   For instructions on how to build TclX on Unix and Unix-like systems,
see unix/INSTALL.  For Windows 95/NT see win/INSTALL.txt.

CHANGES IN TCLX 8.4
=====================
  o Restructure of the sources and build system
  o Removal of TkX extension

FEATURES ADDED BY EXTENDED TCL
==============================

   Here is a summary of the features added by Extended Tcl.  For
more details on the commands and functionality provided by Extended
Tcl, see the manual page man/TclX.man.

    o Keyed lists, a type of list that provides functionality
      similar to C structures.

    o A command tracing facility for debugging and a performance profiler.

    o Unix access commands provide access to many Unix system calls,
      including process management.

    o File control and status commands provide added facilities for
      accessing and manipulating open files.

    o File scanning facility that provides awk-like functionality.

    o Extended list manipulation commands.

    o Extended string and character manipulation commands.

    o X/PG based internationalization commands.

    o Advanced Tcl code library facility that is oriented towards building
      large applications.  It is compatible with standard Tcl auto-loading.

    o Additional general programming commands.

    o Restricted use in a safe interpreter.

    o Support for binary data in most commands.

MANUAL PAGES
============

    Man pages in nroff/troff format are provided for all of Tcl and the
extensions in the doc directory.  Start with the TclX.n manual.

EXTENDED TCL VERSION NAMING
===========================

    Extended Tcl version numbering has been changed to track the 
Tcl/Tk version numbering roughly.

LINKING APPLICATIONS AND EXTENSION WITH TCLX
============================================

   There are three basic approaches to linking TclX into applications or
with other extensions:

   o Dynamically load the C code using either 'package require' or
     the 'load' command.

   o Linking TclX into an application based on the standard Tcl or Tk
     shells (tclsh or wish) or based on your own startup.

See the TclX_Init.3 manual page for more details.  The pkg_mkIndex does not
generate a pkgIndex.tcl file that works with TclX.  See TclX_Init.3 for
instructions on how to setup a pkgIndex.tcl file for use with the
package require command.   There is no need to dynamically load libtkx, its
only there to support wishx and applications that want wishx's signal handling.

TclX will build and install a pkgIndex.tcl that will be automatically found
by Tcl if TclX is installed in the same location.


SUPPORT FOR EXTENDED TCL
========================

We are committed to providing continuing support for Extended Tcl.
Please send questions, bug reports, and bug fixes to:

         http://tclx.sourceforge.net/

There is a mailing list for the development of TclX on Windows 95/NT.
To subscribe, mail majordomo@grizzly.com with the command "subscribe tclx-win"
in the body of the mail.  Send messages to this list at tclx-win@grizzly.com.


WHERE TO GET IT
===============

Extended Tcl can be downloaded by anonymous FTP from:

   ftp://ftp.neosoft.com:/pub/tcl/TclX/tclX*.tar.gz

A contributed sources archive resides on ftp.neosoft.com.
A Frequently Asked Questions (FAQ) document exists in this archive.

Remember to mail Extended Tcl problems and questions to
tcl-project@NeoSoft.com not Dr. John Ousterhout.

THANKS
======

A big thanks to all of the Extended Tcl users from all over the world who
have helped us debug problems and given us valuable suggestions.  A special
thanks to John Ousterhout, his students at Berkeley, and (more recently)
his teams at Sun Microsystems and Scriptics, for Tcl, Tk and all the
support they have given us.

Thanks to Michael E. Shorter <mike@globalware.com>, Christopher M. Sedore
<cmsedore@zombie.maxwell.syr.edu>,  Philip Chow <pchow@isgtec.com>, and
Kirk Benson <benson@healthcare.com> for their initial work on porting TclX
to MS Windows.

Thanks to Jan Nijtmans <nijtmans@wxs.nl> of Plus Patch fame for helping
to get shared library support working for several system.