Hello Ertugrul, Can I use your explanation for the HaskellWiki FRP page[0]? Regards, Henk-Jan van Tuyl [0] http://www.haskell.org/haskellwiki/Functional_Reactive_Programming -- http://Van.Tuyl.eu/ http://members.chello.nl/hjgtuyl/tourdemonad.html Haskell programming --