--- a/doc/interpreter/Makefile.am
+++ b/doc/interpreter/Makefile.am
@@ -118,6 +118,7 @@
   fn-idx.texi \
   func.texi \
   geometry.texi \
+  gui.texi \
   gpl.texi \
   grammar.texi \
   image.texi \

--- a/doc/interpreter/doccheck/aspell-octave.en.pws
+++ b/doc/interpreter/doccheck/aspell-octave.en.pws
@@ -360,6 +360,7 @@
 Hankel
 Hanning
 hardcode
+hardcoding
 Hauberg
 HDF
 hdf
@@ -725,6 +726,7 @@
 Readline
 readline
 recursing
+reentrant
 regex
 regressor
 reimported

new file mode 100644
--- /dev/null
+++ b/doc/interpreter/gui.txi
@@ -0,0 +1,93 @@
+@c Copyright (C) 2011 Rik Wehbring
+@c
+@c This file is part of Octave.
+@c
+@c Octave is free software; you can redistribute it and/or modify it
+@c under the terms of the GNU General Public License as published by the
+@c Free Software Foundation; either version 3 of the License, or (at
+@c your option) any later version.
+@c 
+@c Octave is distributed in the hope that it will be useful, but WITHOUT
+@c ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+@c FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+@c for more details.
+@c 
+@c You should have received a copy of the GNU General Public License
+@c along with Octave; see the file COPYING.  If not, see
+@c <http://www.gnu.org/licenses/>.
+
+@node GUI Development
+@chapter GUI Development
+
+Octave is principally a batch or command-line language.  However, it does
+offer some limited features for constructing graphical interfaces for
+interacting with users.
+
+The GUI elements available are I/O dialogs and a progress bar.  For example,
+rather than hardcoding a filename for output results a script can open a dialog
+box and allow the user to choose a file.  Similarly, if a calculation is
+expected to take a long time a script can display a progress bar.
+
+Several utility functions make it possible to store private data for use with
+a GUI which will not pollute the user's variable space.
+
+Finally, a program written in Octave might want to have long term storage of
+preferences or state variables.  This can be done with user-defined
+preferences.
+
+@menu
+* I/O Dialogs::       
+* Progress Bar::       
+* GUI Utility Functions::       
+* User-Defined Preferences::       
+@end menu
+
+@node I/O Dialogs
+@section I/O Dialogs
+
+Simple dialog menus are available for choosing directories or files.  They
+return a string variable which can then be used with any command requiring
+a file name.
+
+@DOCSTRING(uigetdir)
+
+@DOCSTRING(uigetfile)
+
+@DOCSTRING(uiputfile)
+
+@node Progress Bar
+@section Progress Bar
+@cindex Progress Bar
+
+@DOCSTRING(waitbar)
+
+@node GUI Utility Functions
+@section GUI Utility Functions
+
+These functions do not implement a GUI element but are useful when developing
+programs that do.  @strong{Warning:} The functions @code{uiwait},
+@code{uiresume}, and @code{waitfor} are only available for the FLTK tooolkit.
+
+@DOCSTRING(guidata)
+
+@DOCSTRING(guihandles)
+
+@DOCSTRING(uiwait)
+
+@DOCSTRING(uiresume)
+
+@DOCSTRING(waitfor)
+
+@node User-Defined Preferences
+@section User-Defined Preferences
+
+@DOCSTRING(addpref)
+
+@DOCSTRING(getpref)
+
+@DOCSTRING(ispref)
+
+@DOCSTRING(rmpref)
+
+@DOCSTRING(setpref)
+

--- a/doc/interpreter/io.txi
+++ b/doc/interpreter/io.txi
@@ -28,7 +28,6 @@
 @menu
 * Basic Input and Output::      
 * C-Style I/O Functions::       
-* GUI Dialogs for I/O::       
 @end menu
 
 @node Basic Input and Output
@@ -1065,16 +1064,3 @@
 @end group
 @end example
 
-@node GUI Dialogs for I/O
-@section GUI Dialogs for I/O
-
-Simple dialog menus are available for choosing directories or files.  They
-return a string variable which can then be used when calling any command
-requiring a file name.
-
-@DOCSTRING(uigetdir)
-
-@DOCSTRING(uigetfile)
-
-@DOCSTRING(uiputfile)
-

--- a/doc/interpreter/octave.texi
+++ b/doc/interpreter/octave.texi
@@ -213,6 +213,7 @@
 * Image Processing::            
 * Audio Processing::            
 * Object Oriented Programming::            
+* GUI Development::            
 * System Utilities::            
 * Packages:: 
 * Dynamically Linked Functions::
@@ -476,7 +477,6 @@
 
 * Basic Input and Output::      
 * C-Style I/O Functions::       
-* GUI Dialogs for I/O::       
 
 Basic Input and Output
 
@@ -754,6 +754,13 @@
 * Operator Overloading::
 * Precedence of Objects::
 
+GUI Development
+
+* I/O Dialogs::       
+* Progress Bar::       
+* GUI Utility Functions::       
+* User-Defined Preferences::
+
 System Utilities
 
 * Timing Utilities::            
@@ -855,7 +862,7 @@
 Reporting Bugs
 
 * Bug Criteria::                
-* Bug Tracker::ff               Where to submit your bug report.
+* Bug Tracker::                 Where to submit your bug report.
 * Bug Reporting::               How to report a bug effectively.
 * Sending Patches::             How to send a patch for Octave.
 
@@ -914,6 +921,7 @@
 @include image.texi
 @include audio.texi
 @include oop.texi
+@include gui.texi
 @include system.texi
 @include package.texi
 

--- a/doc/interpreter/strings.txi
+++ b/doc/interpreter/strings.txi
@@ -147,6 +147,12 @@
 @end group
 @end example
 
+In scripts the two different string types can be distinguished if necessary
+by using @code{is_dq_string} and @code{is_sq_string}.
+
+@DOCSTRING(is_dq_string)
+
+@DOCSTRING(is_sq_string)
 
 @node Character Arrays
 @section Character Arrays

--- a/doc/interpreter/system.txi
+++ b/doc/interpreter/system.txi
@@ -503,6 +503,8 @@
 
 @DOCSTRING(octave_config_info)
 
+@DOCSTRING(usejava)
+
 @DOCSTRING(getrusage)
 
 @node Hashing Functions

--- a/scripts/plot/guidata.m
+++ b/scripts/plot/guidata.m
@@ -18,7 +18,7 @@
 
 ## -*- texinfo -*-
 ## @deftypefn  {Function File} {@var{data} =} guidata (@var{handle})
-## @deftypefnx {Function File} guidata (@var{handle}, @var{data})
+## @deftypefnx {Function File} {} guidata (@var{handle}, @var{data})
 ## @end deftypefn
 
 ## Author: goffioul

--- a/scripts/plot/uicontrol.m
+++ b/scripts/plot/uicontrol.m
@@ -19,7 +19,7 @@
 ## -*- texinfo -*-
 ## @deftypefn  {Function File} {@var{handle} =} uicontrol ('Name', value, @dots{})
 ## @deftypefnx {Function File} {@var{handle} =} uicontrol (@var{parent}, 'Name', value, @dots{})
-## @deftypefnx {Function File} uicontrol (@var{handle})
+## @deftypefnx {Function File} {} uicontrol (@var{handle})
 ## @end deftypefn
 
 ## Author: goffioul

--- a/scripts/plot/uiresume.m
+++ b/scripts/plot/uiresume.m
@@ -17,7 +17,7 @@
 ## <http://www.gnu.org/licenses/>.
 
 ## -*- texinfo -*-
-## @deftypefn {Function File} uiresume (@var{h})
+## @deftypefn {Function File} {} uiresume (@var{h})
 ## Resume program execution suspended with @code{uiwait}.  The handle @var{h}
 ## must be the same as the on specified in @code{uiwait}.  If the handle
 ## is invalid or there is no @code{uiwait} call pending for the figure

--- a/scripts/plot/uiwait.m
+++ b/scripts/plot/uiwait.m
@@ -17,9 +17,9 @@
 ## <http://www.gnu.org/licenses/>.
 
 ## -*- texinfo -*-
-## @deftypefn  {Function File} uiwait
-## @deftypefnx {Function File} uiwait (@var{h})
-## @deftypefnx {Function File} uiwait (@var{h}, @var{timeout})
+## @deftypefn  {Function File} {} uiwait
+## @deftypefnx {Function File} {} uiwait (@var{h})
+## @deftypefnx {Function File} {} uiwait (@var{h}, @var{timeout})
 ## Suspend program execution until the figure with handle @var{h} is
 ## deleted or @code{uiresume} is called.  When no figure handle is specified,
 ## this function uses the current figure.

--- a/scripts/prefs/addpref.m
+++ b/scripts/prefs/addpref.m
@@ -27,7 +27,7 @@
 ## of character strings.  The corresponding value @var{val} may be any
 ## value, or, if @var{pref} is a cell array of strings, @var{val}
 ## must be a cell array of values with the same size as @var{pref}.
-## @seealso{pref, getpref, ispref, rmpref, setpref}
+## @seealso{setpref, getpref, ispref, rmpref}
 ## @end deftypefn
 
 ## Author: jwe

--- a/scripts/prefs/getpref.m
+++ b/scripts/prefs/getpref.m
@@ -37,7 +37,7 @@
 ##
 ## If no arguments are specified, return a structure containing all
 ## groups of preferences and their values.
-## @seealso{addpref, ispref, rmpref, setpref}
+## @seealso{addpref, setpref, ispref, rmpref}
 ## @end deftypefn
 
 ## Author: jwe

--- a/scripts/prefs/ispref.m
+++ b/scripts/prefs/ispref.m
@@ -28,7 +28,7 @@
 ##
 ## If @var{pref} is not specified, return true if the preference
 ## group @var{group} exists.
-## @seealso{addpref, getpref, rmpref, setpref}
+## @seealso{getpref, addpref, setpref, rmpref}
 ## @end deftypefn
 
 ## Author: jwe

--- a/scripts/prefs/rmpref.m
+++ b/scripts/prefs/rmpref.m
@@ -30,7 +30,7 @@
 ## @var{group}.
 ##
 ## It is an error to remove a nonexistent preference or group.
-## @seealso{addpref, getpref, rmpref, setpref}
+## @seealso{addpref, ispref, setpref, getpref}
 ## @end deftypefn
 
 ## Author: jwe

--- a/scripts/prefs/setpref.m
+++ b/scripts/prefs/setpref.m
@@ -29,7 +29,7 @@
 ## must be a cell array of values with the same size as @var{pref}.
 ##
 ## If the named preference or group does not exist, it is added.
-## @seealso{pref, getpref, ispref, rmpref, setpref}
+## @seealso{addpref, getpref, ispref, rmpref}
 ## @end deftypefn
 
 ## Author: jwe