******************************************************************
**                                                              **
**              IBM PC Installation of DISGCL                   **
**                                                              **
**  Contents:  1.)  Introduction                                **
**             2.)  Installation of DISGCL                      **
**                                                              **
**  Date   :   20.09.2002                                       **
**  Version:   4.0     /  Windows 9x/NT/2000/XP                 **
**  Author :   Helmut Michels, MPI fuer Aeronomie,              **
**             D-37191 Katlenburg-Lindau, Germany               **
**             E-mail: michels@linmpi.mpg.de                    **
******************************************************************

1.)  Introduction
   
     This file describes the installation of the  graphics command
     language DISGCL which is an interpreter based on the graphics
     software DISLIN.  All  DISLIN  statements can be written to a
     script file  and then be executed with DISGCL,  or can be en-
     tered in an interactive mode.

     Similar to programming languages such as Fortran and C, high-
     level language elements can be used within DISGCL.  These are
     variables, operators, expressions,  array operations,  loops,
     if and switch statements, user-defined  subroutines and func-
     tions, and file I/O routines.

     An easy to use  interface  for data input is given to include
     data into  DISGCL jobs.  The  format  of data files  is  very
     simple and useful for most DISLIN plotting routines.

     Several quickplots are offered by  DISGCL which are collecti-
     ons of DISLIN statements to display data with one command.

     Notes: 

      - An installation of DISLIN is not necessary for DISGCL.

      - This version of DISGCL is free software;  you can make co-
        pies and redistribute it. The software is  distributed  in
        the hope that it will be useful, but WITHOUT ANY WARRANTY.


2.)  Installation of DISGCL

     The Windows 95 version of DISGCL is distributed as a  .zip
     file created with the file packaging utility ZIP (version
     1.9). The .zip file has the file name GCL_nn_W.ZIP where  nn
     is the current version number of DISGCL.

     To install DISGCL, make the following steps:

  a) Create a temporary directory and copy all files from the
     distribution disk to the directory:

     for example:   md  c:\temp
                    cd  c:\temp
                    copy a:\*.*  *.*

  b) Extract GCL files with the command:

                    unzip -o GCL_40_W 

  c) Run the SETUP program with the command

                    setup

     -  Choose OK

     -  Give the Installation Directory where DISGCL should be in-
        stalled. The default directory is C:\DISLIN.

  d) Reconfigure the system

     Add the DISLIN environment variable DISLIN to the file
     AUTOEXEC.BAT.

     For example:  SET DISLIN=C:\DISLIN  

     Add the DISLIN\WIN directory to the PATH environment in
     AUTOEXEC.BAT.

     For example:  PATH C:\BIN;C:\DISLIN\WIN