This is the README of the XOP extension "topo"

Definitions:
============

"XOP" : A multiplatform graphical user interface  for synchrotron 
        radiation spectral and optics calculations. For more info, see:
        http://www.esrf.fr/computing/expg/subgroups/theory/idl/xop/xop.html

"XOP extension" is a software package which is not part of the XOP 
                installation, but it can be installed optionally and run 
                under the XOP interface.


TOPO:
=====
TOPO is a program to perform
analysis on profiles and surfaces written by
David L. Windt (windt@bell-labs.com)
To install and run TOPO under XOP, you should get the standard
distribution from D. Windt (see http://www.bell-labs.com/user/windt/idl
and then reproduce the structure described in this file in your
$XOP_HOME/extensions directory.

installation and customization of TOPO for XOP-EMBEDDED
========================================================
  1) Download the TOPO package
  2) Copy the files to reproduce the following structure in the 
     "extensions" directory of your local XOP installation:
     $XOP_HOME/extensions/xtopo.sav [file from this aftp directory]
     $XOP_HOME/extensions/topo/topo.html [file from this aftp directory]
     $XOP_HOME/extensions/topo/topositeconfig.pro [file from this aftp
                             directory = customization of the original one]
     $XOP_HOME/extensions/topo/topositeconfig.pro [file from this aftp dir]
     $XOP_HOME/extensions/topo/topo.bat [file from this aftp directory]

     $XOP_HOME/extensions/topo/topo_5 [file from TOPO package]
     $XOP_HOME/extensions/topo/wyko_example.dat [file from TOPO package]

     [under windows, read %XOP_HOME% insteed of $XOP_HOME and \ instead
      of /] 
  3) Start TOPO by either

     Under Unix:
     a) type at the Unix prompt
        xop xtopo
     b) From the main XOP window, select Tools|IDL Macro, empty the
        window, type "xtopo" on it and exit using "Quit and accept changes"

     Under Windows (it is very important NOT to split the command lines!): 
     a) double click on file c:\xop\xtopo.bat
        (you may create a shortcut to start it from the Menu Bar)
     b) From the main XOP window, select Tools|IDL Macro, empty the
        window, type "xtopo" on it and exit using "Quit and accept changes"