                       The XMOD package - version 2.006

This is the README file for the GAP package ``XMOD''.

This package allows for computation with crossed modules;
cat1-groups; morphisms of these structures; 
derivations of crossed modules and the corresponding sections of cat1-groups.

Version 1 of ``XMOD'' was accepted for GAP3R4P4 in December 1996.
The first version for GAP4 was XMod 2.001, released in April 2002.
This version is released in September 2004.

The ``XMOD'' package is distributed with the accepted GAP packages.

It may also be obtained from the Bangor ftp pages for
Computational Higher-dimensional Discrete Algebra at:
  http://www.informatics.bangor.ac.uk/public/mathematics/chda/

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

Installing `XMod':

1) unpack `xmod.2.006.tar.gz' in the `pkg' subdirectory of the GAP root
   directory.

2) From within GAP load the package with:

gap> LoadPackage("xmod");
true

3) The documentation is in the `doc' subdirectory.

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

Chris Wensley and Murat Alp  -  September 2004.
