******************************************************************
**                                                              **
**                IBM PC Installation of GCL                    **
**                                                              **
**  Contents:  1.)  Introduction                                **
**             2.)  Installation of GCL                         **
**                                                              **
**  Date   :   01.11.1996                                       **
**  Version:   2.1     /  Windows 95                            **
**  Author :   Helmut Michels, MPI fuer Aeronomie,              **
**             Postfach 20, D-37189 Katlenburg-Lindau           **
**             E-mail: michels@linax1.mpae.gwdg.de              **
******************************************************************

1.)  Introduction
   
     This file describes the installation of the  graphics command
     language  GCL  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 GCL,  or can be entered
     in an interactive mode.

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

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

     Several quickplots are offered by  GCL  which are collections 
     of DISLIN statements to display data with one command.

     Notes: 

      - An installation of DISLIN is not necessary for GCL.

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


2.)  Installation of GCL

     The Windows 95 version of GCL 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.ZIP where  nn is the
     current version number of GCL.

     To install GCL, 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_21 

  c) Run the SETUP program with the command

                    setup

     -  Choose OK

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


  d) If you have changed the  Installation Directory,  you  should
     add the command SET DISLIN=xxx to the file AUTOEXEC.BAT where
     xxx is the new Installation Directory of DISLIN.


    
