Can't wait for more!
A round robin is a story written by several writers. For example: you write chapter one, I write chapter two, someone else writes chapter three and so on. Some are pre-decided so you know what chapter(s) will be yours, but it can also be first come, first go. Meaning that when you read a chapter and you think: 'mmm, I know how to continue from here.' you just do.
Hope this made it more clear.

Author's Response: Brilliant, thanks. Sounds like a blast, a more sophisticated version of the scribblings game you pass round at parties.