In some sort of vague attempt to prolong the death of intellectual property for a while, please note that the Infocom HHGG game is still copyright. I know that, by way of us being the copyright owners. Xcalibur.co.uk is not licensed to run the game. For the functionally identical but kosher version, see http://www.douglasadams.com/creations/infocomjava. html
Richard