You enter the Museum of Man and examine the exhibits.
Aside from being a space program, Gemini also appears to be a protocol similar to gopher, but updated for a later era. You get the feeling that gemini might be required for the Text Adventure exhibit.
Learn more about: Gemini
To enter the text adventure capsule, you need a gemini client.
Enter: gemini://text.adventuregameclub.com
Back to the Museum of Man