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			 SWI-Prolog for Win32
			    Jan Wielemaker
			       06/06/94

			  (Updated: 14/06/96)
			   (Version 2.7.8)


This distribution contains SWI-Prolog for   Windows-'95,  Windows-NT and
Windows 3.1/Win32s. SWI-Prolog runs  in   a  simple  MS-Window providing
traditional stream-based interaction or as a Win32 console application.


Installation:
=============

Unpack the archive anywhere  you  like.   You  can  start  SWI-Prolog by
starting the executable bin\plwin.exe. *DO NOT*   move  plwin.exe, as it
uses the path-name of the executable to find its home directory. You may
wish to create an ICON for it. Either   do this by hand using the normal
program-manager UI or start SWI-Prolog by double clicking the executable
and typing:

	?- progman_setup.

which  will  create  the  program  group  SWI-Prolog  and  an  icon  for
SWI-Prolog in this group.  The default working directory is set to C:


Redoing the boot compilation
============================

The system normally loads the Prolog code from the file startup\startup.
If you changed anything to the Prolog   sources in the boot directory or
the system appears to have path-problems   with system related files, it
may be wise to redo the boot compilation.  To do this, run the command

	bin\plwin.exe -O -o startup\startup -b boot\init.pl

The current working directory must  be   the  Prolog base directory.  In
both Windows-95 as NT, you can run this   from a DOS-box, in Windows 3.1
you will have to use the "Run ..." option from the program manager.


SWI-Prolog and 8-bit characters (programming readline)
======================================================

If you built SWI-Prolog  using  the   readline  library,  by default you
cannot enter 8-bit characters from  the   terminal  as  the GNU readline
library  maps  any   character   with   the    high-bit   set   to   ESC
<character-with-8bit-cleared>. To fix this, create a file ~/.inputrc and
add the following lines:

################################################################
set convert-meta off
set output-meta  on
################################################################

Actually, the readline version underlying  the   Win32  version  is 1.2,
which does not define the  "output-meta"   variable,  but  this does not
harm.

Note that ~/.inputrc is the file named .inputrc in the directory pointed
to by the variable %HOME%.  This  does   not  work  under  Win32s, where
.inputrc is an  invalid  filename.  Instead,   create  a  file  using an
arbitrary name (inputrc for the example) and run:

	?- rl_read_init_file(inputrc).

See readline(3) for details.

Status:
=======

The first four releases were based  on   the  WATCOM 32-bit extender for
Windows 3.1. The 5th release has   been  developed with Microsoft Visual
C/C++ 2.0 under Windows-NT 3.5.  This   release  was compiled and tested
under Windows-'95 using MSVC 2.0. It has been used in the development of
XPCE for quite a while and appears  to   run  stable  on '95 and -NT and
reasonable (compared to the operating system :-) under win32s.

This version has Virtual Memory Management   based stack expansion (i.e.
no stack-shifter and thus no bugs therein :-).

This version also handles crashes often gracefully.


Version 2.5.[0-2] windows-specific changes
======================================

	None sofar!


Version 2.1.14 windows-specific changes
=======================================

	* Fixed bug in the garbage collector, which is certainly
	relevant on win32s, but maybe relevant under NT and '95 too.
	This but is irrelevant for the Unix versions.


Version 2.1.13 windows-specific changes
=======================================

	* Changed statistics(cputime, X) to use the Win32
	GetProcessTimes() call when supported (NT only, it appears).
	This implies that the system returns quite accurate process
	user time under NT and wall-clock time minus the time waiting
	for user-input under Windows '95 and Windows 3.1/win32s.


Version 2.1.10 windows-specific changes
=======================================

	* added ISO compliant open/4 that allows you to open files
	  both in text and binary mode.

	* Added ISO compliant character-escape codes for reading
	  quoted atoms.  This is notably problematic when using
	  DOS filenames: ?- ['c:\new.pl'] will cause the system to look
	  for the file

		c:
		ew.pl

	  which, of course, it cannot find.  Either use \\ or the Unix /
	  to separate path-components.  Note that
	  set_feature(character_escapes, false) may be used to switch
	  back to the old behaviour.

	* Added proper color handling to the console window (reading
	  the users color-settings).  Changed font to be the stock
	  ANSI fixed font rather then the system font.  Not that
	  colors may be changed using:

		?- load_foreign_library(dlltest).
		?- rlc_color(window, 255, 0, 0).

	  The first argument is window, text, highlight or
	  highlighttext.  See also dlldemo\dlltest.c.

	* Fixed filename completion from the console window.

	* The console window now signals end-of-file both on the
	  Unix Control-D as the DOS Control-Z.

	* Fixed expand_file_name/2 to be case-insensitive.  This fixes
	  make/0.

	* Added support for name-associations.  If a file is saved using
	  qsave_program/2 with the extension .QLX, associating plwin.exe
	  with .QLX files will make them self-starting.

	  Associating plwin.exe with .PL files will cause Prolog to
	  start, change directory to the directory holding the file and
	  load the file.

	* Handle Control-C to interrupt execution correctly in most
	  cases.

	* Fixed name/2 and friends to use 8-bit characters properly
	  if compiled on a compiler treating char as signed (MSVC++).


Version 2.0.6 windows-specific changes
======================================

	* Added DDE server interface and some more options to the DDE
	  client interface.

	* Added DLL interface.  I know it loads 32-bit NT DLL's, I don't
	  think it will load 16-bit Windows DLL's, but I'm not sure.

	* The console may now be used with 2-button mice.  `Paste',
	  normally assigned to the middle button may be activated using
	  Alt-Y or pressing both buttons at the same time (three-button
	  emulation as done by many X-servers).

	* Long-filename handling is (as yet) based on how NT handles
	  long filenames on FAT partitions.  Only activated for Win32s;
	  NT has long filenames.

	* Representation of absolute paths has changed from /c:/... to
	  the more natural c:/...  Use is_absolute_file_name/1 to test
	  whether a filename is absolute.  The old /c:/... is accepted
	  as well.

	* Installation is now very simple: just unpack the whole lot
	  any place you like and start the binary (.../bin/plwin.exe).
	  You can make an icon for it.  *DON'T* move plwin.exe and the
	  DLL files to another directory as the pathname of the 
	  executable is used to determine the home directory.


Version 1.9.5 windows-specific changes
======================================

	* Fixed floating-point representation problem
	* Fixed DDE interface (my mistake, to which Don Dwiggens pointed
 	  me).
	* Added dde_execute/2 to give DDE execution commands.

Version 1.9.4 windows-specific changes
======================================

	* Compiled for floating-point emulations on machines that
	  lack floating point hardware.
	* Fixed memory management bug in stack-expander.
	* Added DDE interface.
	* Added editor declaration for Windows notepad.
	* Fixed problem in file-name mapping that caused existing
	  files to be reported as non-existing sometimes.

Version 1.9.0 windows-specific changes
======================================

	* Filename conversion and finding the home-directory is
	  fixed.
	* The drive's root directory is now handled properly.
	* Fatal errors will now often :-( show a Windows message-box
	  instead of just quiting Prolog.  This allows you to read
	  the message :-)
	* Control-C break is tested in the main virtual machine loop.
	  A few procent slower, but it does allow you to break a
	  looping program ...
	* Cut-and-paste is implemented in the console-window, allowing
	  for xterm-like cut-and-paste (left/right to start/extend the
	  selection and middle to paste it).
	* Improved error reporting.
	* Now Writes files in DOS text-format rather then using binary
	  mode.
	* Installation has changed a bit.  Read it!
	  ============


Copyright:
==========

SWI-Prolog may be  distributed  freely   for  non-commercial  use.   See
pl\licence for a more complete description of your rights.