Windows XP (and other)
The 32 bits version of the program satisfies to the demands of
Microsoft in relation to the installation. This is attained
with the use of a installation (setup) program.
This installation program adjusts for instance the Windows
registry. This has two important consequences:
1. By clicking under Windows on "Setups/Configuration
screen/Software" the program package can be automatically
uninstalled, including the maps, program groups and the
cleaning up of the Windows registry. Un installation is
supported from the desktop as well.
2. In the Windows registry icons are registered belonging
to respectively the input files (*.RWI) and the output files
(*.RWU) for the 2-dimensional part of the framework program.
For the 3-dimensional part of the framework program these 
extensions are (*.R3I) and (*R3U) respectively. 
By this it is possible to double click at this files with those
icons in front of it and then the framework program will be
started automatically, independent of the place of the files at
the hard disk (it is even allowed that the files are placed via
the LAN on an other computer).
By double clicking at a *.RWI or *.R3I file the framework program
will load the data file and is ready then to inspect and change
the input data of an old problem, after which the calculation can
be started again.
Programming language
The program is written with the aid of DELPHI; a WINDOWS
programming environment from Borland (CodeGear); 
see: http://www.codegear.com/products/delphi/win32.
Delphi is known as: Rapid Application Development system (RAD).
   
An other example is Visual Basic from Microsoft.
Although the most important target group of DELPHI are the
programmers of front-ends of relational databases DELPHI can
very well be used for the development of other applications
(this program is a proof).
At the basis of DELPHI lies the old trustworthy PASCAL-compiler
from BORLAND (a perhaps better name for DELPHI should be:
"Visual Pascal"). 
The coding of the for Windows characterizing screen elements
happens in DELPHI at a graphical interactive way. At the base
of DELPHI lies the "FORM", on which other screen elements such
as "buttons, combo boxes, radio buttons, check buttons etc." can
be simply dropped.
Every FORM and screen element incorporates so called
"PROPERTIES" and "EVENTS". The PROPERTIES determines the
specific setups, the EVENTS describes the various possible
actions which a FORM are an other screen element can undergo.
DELHPI generates automatically from the graphical displayed
FORMS and other screen elements a skeleton of the PASCAL
source. It is even possible to click at the regarding screen
element in order to jump automatically to the accessory Pascal
source.
An advantage of DELPHI is also that programming can take place
at different levels.
The object oriented approach DELPHI is based on does not have
to extend to the whole program; for instance the calculation
part of the program. It is allowed to program some parts at the
old fashioned structured procedural way; I call this mix mode
programming. The Windows user interface is of course programmed
with the aid of object orientation (the strength of DELPHI)
When the possibilities of the in DELPHI incorporated visual
object oriented toolbox (Visual Component Library) in
particular cases are not sufficient enough then can be
programmed directly at the level of Windows itself (WIN-API).
An other kind of mixed programming
The functionality of DELPHI can even be expanded by building
components by the user (are can be bought of be downloaded from
the Internet); also components from Visual Basic can be
incorporated (OCX en ActiveX).
The program uses the principle of the Multi Document Interface
(MDI) through which in principle a infinite number of windows
can be opened at the same time. This makes it possible to open
a alfa-numerical input window next to a graphical window; this
way changes in the numerical input window can be reflected
direct at the graphical window and vice versa..
Between load cases in the program can simply be switched by
clicking at the tab sheets at the bottom of the graphical
windows.
The program is further supplied with inter active help at
different levels:
  -   yellow text "balloons" at the  speed buttons,
  -   context sensitive messages at the panel at the bottom of
      the screen,
  -   comprehensive help pages with hypertext (switching
between topics and pages, search functions etc.).
For the first two mentioned help levels above within DELPHI
nothing has to be programmed (only typing the text in the
concerning PROPERTY).
Programming under Windows
DELPHI makes use of object oriented programming principles, a
relative new way of programming/
Now available for instance with DELPHI, Borland Pascal, J-
Builder, C-Builder and various C++ compilers.
The advantage of using objects is that the wheel not always has
to be reinvented. By the mechanism of inheritance the object
made by the programmer, which is derived from an existing
specific DELPHI object, possesses automatically all the
elements of the mother DELPHI object.
The handling of the mouse in a program is for instance
completely hidden in the object oriented DELPHI toolbox; the
consequence is that the programmer does not have to border with
the steering of the mouse (its seems to go automatic).
Programming under Windows is rather different than programming
under MS-DOS. With MS-DOS as operating system the programmer
"talks" rather direct to the computer. Under Windows the
communication between the program and the computer is not
directly; direct communication is not allowed even. The program
"talks" with Windows and only Windows "talks" to the computer
hardware (multy layers) For an experienced MS-DOS this takes a
change in attitude. Also the complexity and extensiveness of
the API under Windows constitutes a high threshold. This
threshold becomes much lower when DELPHI is used.
Further tools are available in DELPHI for direct graphic
interactive designing of various screen elements.
Advantages of Windows as an operating system
Besides the uniform graphical user interface of Windows the
advantage of Windows in relation to MS-DOS is that each device
(screen, printer etc.) not apart have to be programmed for each
type in an other way (there are a lot of printers in the
outside world); Windows takes care of all of it.
The quality of the various device drivers from different
manufacturers is not always at the same (high) level; therefore
(negative) surprises can not be excluded unfortunately.
Not always the details shown at the monitor screen (colors,
shapes etc.) are the same when printed on paper.
An very important feature of Windows is the break through of
the notorious 640 kB memory limit, which exists under MS-DOS.
Windows supports also virtual memory (the RAM memory can partly
dynamically be moved to a scratch-file at the hard disk).
Because Windows 3.1 possesses a 16 bits memory addressing
system the programmer has still to wrestle with the also form
MS-DOS known segmentation of the memory in 64 kB blocks. Only
with the use of rather complicated pointer arrhythmic these
block segmentation can be circumvented (needed to declare
matrixes larger then 64 kB).
For the 32 bits version these memory limitations are not longer
in force. 
Available is a theoretical linear memory with a size of 2 GigaByte
(2000 Mbyte).
The memory under Windows is not addressed anymore directly but
via a Selector Table.
Thanks to this memory addressing scheme Windows is able to use
a advanced type of memory management. Characteristic features
are for instance automatic garbage collection and automatic
program and data overlays. Also Windows cares for the emulation
of a absent numerical coprocessor (from and above the Pentium
all processors have a build in co-processor however).
Windows therefore takes care of many functions which under MS-
DOS explicitly should have been programmed.