More "textland" than anything else, though that has to do with the medium we're using to communicate "across space and time." What Alan has advocated is that the medium we're using in this particular instance should be a version of "systemland."
(For example, I came back to this thread from email notification.)
If you want a demo, you can take a look here:
However, IMHO, there are a few limitations with these "desktop" type of environments:
1. Limited I/O capability.
2. Limited Network capability.
3. Limited mobility.
Follow the trails outlined by Bret Victor: http://worrydream.com/TheHumaneRepresentationOfThought/note.... , it seems that we are yet to find the "systemland" for the future.