I found this game in a pile of old CDs. Loaded it up on my Windows 98 VMWare image and played it. The Multi-Player doesn't work (as I assume Knowledge Adventure isn't running the server anymore), but the Single-Player performs exactly the same as the Multi-Player (without other people).
This is a full walkthough of the entire island (as much as I can remember). I tried my best to avoid the JumpStart demos.
The purpose behind the game is that you can interact with other people in this world (assuming you are playing Muli-Player) like an online chatroom. There are also various knowledge "cards" scattered around the world. You can trade these cards with other players or combine them together to get points (based on the common themes between the cards). With enough points, you can purchase different avatars.
Pretty simple.