The eDonkey2000 'core' is the actual edonkey program which does
everything behind the scenes - connecting to servers, searching,
downloading, uploading, all that stuff.

The 'core' comes with a very simple text interface (=command line
client), where you can tell it what to do by typing in commands.

Check http://www.edonkey2000.com/ and the WWW site below.

WWW: http://users.aber.ac.uk/tpm01/guihome.html