A remix is an exchange, and technically prompt-based, too. The difference is that, in a remix, participants are assigned another participant, and they basically rewrite a fic that their assignee has written in the past: changing POV, making it more sequel/prequelish, et cetera. Some examples include hd_remix and remix_redux. :D
nqdonne explained it much better than I could here (http://nqdonne.livejournal.com/317000.html#cutid1), in the context of a Percy remix fest.
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Date: 2007-10-04 10:36 pm (UTC)Hope that helps!