NoCK is a GAP4 package.
To install the package NoCK move the file
NoCK-XX.tar.gz (or any other archive containing it) into the
Usually this will be the
pkg subdirectory in your GAP4 installation. However, it is also possible to have a
pkg subdirectory in a different place, see the section ‘Installing GAP Packages’ of the GAP4 reference manual for more information. Then simply unpack
NoCK-XX.tar.gz and your installation is complete.
Now start GAP and type
gap> LoadPackage( "NoCK" );
to load the package. You will see the package banner.
For details on how to use the NoCK package see the package documentation in the doc subdirectory (view its HTML version or manual.pdf via a PDF viewer). You will find additional information on how to create a GAP package in the Appendix of the manual.
The manual of NoCK is contained in /pkg/NoCK-XX/doc. An online version can be found here.