Derelict was created with Inform and has IFID 34E34D5A-C4A2-41FA-A84A-192D4519BA52. To play a work like this one, you need an interpreter program: many are available, among them Gargoyle
for Mac OS X or Windows; Windows Frotz or Windows Glulxe for Windows. The postcard was written by Andrew Plotkin and designed by Lea Albaugh.
Or you can play without downloading anything by following the 'Play In-Browser'
link, using the Quixe interpreter. You'll need to have Javascript enabled
on your web browser.