Here are the links that hold the information you desire:
http://www.haskell.org/haskellwiki/Frag
http://www.cse.unsw.edu.au/~pls/thesis/munc-thesis.pdf
In short: FRP
http://www.haskell.org/frp/
I have a small question...
Given that interactivity is Really Hard to do in Haskell, and that mutable state is to be strongly avoided, how come Frag exists? (I.e., how did they successfully solve these problems?)
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