Turbo Vision help file compiler (TVHC.EXE).
             ===========================================

    Refer to OOPHELP.TXT for an example of a help source file.

    This program takes a help script and produces a help file (.HLP)
    and a help context file (.PAS).  The format for the help file is
    very simple.  Each context is given a symbolic name (i.e FileOpen)
    which is then put in the context file (i.e. hcFileOpen).  The text
    following the topic line is put into the help file.  Since the
    help file can be resized, some of the text will need to be wrapped
    to fit into the window.  If a line of text is flush left with
    no preceding white space, the line will be wrapped.  All adjacent
    wrappable lines are wrapped as a paragraph.  If a line begins with
    a space it will not be wrapped. For example, the following is a
    help topic for a File|Open menu item.

       |.topic FileOpen
       |  File|Open
       |  ---------
       |This menu item will bring up a dialog...

    The "File|Open" will not be wrapped with the "----" line since
    they both begin with a space, but the "This menu..." line will
    be wrapped.
      The syntax for a ".topic" line is:

        .topic symbol[=number][, symbol[=number][...]]

    Note a topic can have multiple symbols that define it so that one
    topic can be used by multiple contexts.  The number is optional
    and will be the value of the hcXXX context in the context file
    Once a number is assigned all following topic symbols will be
    assigned numbers in sequence.  For example,

       .topic FileOpen=3, OpenFile, FFileOpen

    will produce the following help context number definitions,

        hcFileOpen  = 3;
        hcOpenFile  = 4;
        hcFFileOpen = 5;

    Cross references can be imbedded in the text of a help topic which
    allows the user to quickly access related topics.  The format for
    a cross reference is as follows,

        {text[:alias]}

    The text in the brackets is highlighted by the help viewer.  This
    text can be selected by the user and will take the user to the
    topic by the name of the text.  Sometimes the text will not be
    the same as a topic symbol.  In this case you can use the optional
    alias syntax.  The symbol you wish to use is placed after the text
    after a ':'. The following is a paragraph of text using cross
    references,

      |The {file open dialog:FileOpen} allows you specify which
      |file you wish to view.  If it also allow you to navigate
      |directories.  To change to a given directory use the
      |{change directory dialog:ChDir}.

    The user can tab or use the mouse to select more information about
    the "file open dialog" or the "change directory dialog". The help
    compiler handles forward references so a topic need not be defined
    before it is referenced.  If a topic is referenced but not
    defined, the compiler will give a warning but will still create a
    usable help file.  If the undefined reference is used, a message
    ("No help available...") will appear in the help window.

    The help file is created by typing the information using any word
    processor and conveniently in the IDE of Turbo Pascal itself.
    The extended ASCII characters such as ß and Ü are entered by holding
    down the Alt key and entering the ASCII values such as 223 and 220
    using the Numeric Keypad to the right of the keyboard, releasing the
    Alt key after each numeric entry.

  =======================================================================

Header for program TVHC.PAS  ->  .EXE

program TVHC;

{$S-}

{$M 8192,8192,655360}

uses Drivers, Objects, Dos, HelpFile;

.
.
.

  =======================================================================

         Syntax for use of the help file compiler TVHC.EXE
  =======================================================================


  Syntax:  TVHC <Help text>[.TXT] [<Help file>[.HLP] [<Symbol file>[.PAS]]
     Help text   = Help file source
     Help file   = Compiled help file
     Symbol file = A Pascal file containing all the screen names as CONST's


  e.g.  TVHC OOPHELP.TXT OOPHELP.HLP OOPHELP.PAS


  The [<Symbol file>[.PAS]] is created as a Unit and must then be compiled
  by the normal Turbo Pascal Compiler to produce [<Symbol file>.TPU].
  <Symbol file> must be declared in the USES statement at the start of the
  Turbo Vision program for which the help file has been created.
  Thus for the Turbo Vision program OOPTUTOR.PAS, the Uses statement
  includes OOPHELP, as shown below:

program OOPTutor;

{$X+,S-}
{$M 16384,8192,655360}
.
.
.
uses
  Dos, Objects, Drivers, Memory, Views, Menus, Dialogs, StdDlg, MsgBox, App,
  DemoCmds, Gadgets, FViewer, HelpFile, OOPHELP, ColorSel, MouseDlg, Hexa,
  Crt;                                  ========


  =======================================================================

              Extract from the help file OOPHELP.TXT
  =======================================================================


  .topic NoContext=0
 Turbo Pascal OOP Tutor and Examples Ü
  ßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßß
Welcome to Turbo Pascal OOP Tutor.  This program allows notes on Turbo
Pascal OOP to be viewed in a scrollable window, whilst the source code
for a number of examples can also be inspected. These example programs
can be run as executable files (.EXE) from the tutor screen.
The ð menu is accessed by pressing Alt-Space.  All the other menus are
accessed by pressing Alt-Z, where Z is the first letter of the menu.
For example, the "Notes" menu is pulled down by Alt-N.

Press ESC to put this help screen away.

.topic Viewer=2
 File viewer Ü
  ßßßßßßßßßßßß
A file viewer views the contents of a text file. You can use the
arrow keys to move about in the file. A file is loaded via the
{File³Open:FOpen} menu item.
.
.
.
.topic RightOOP
 RightOOP Ü
  ßßßßßßßßß
This program can be run by selection using the arrow keys and
pressing ENTER, or else by pressing the highlighted key i.

This is an example of object-oriented programming using virtual
methods.
.
.
.