It's an adaptation of the Aardwolf GMCP Handler, by Lasher, to work on Materia Magica.
2024 Instructions
If you are using the MUSHclient package available on the Materia Magica website, you should already have all the necessary files referenced in the original instructions below. All you should need to do is:
From now on, you will see an additional world window open for sandbox.dune.net. You just need to leave it open and ignore it.