[Haskell-cafe] seq - RTFM?

[Dusan Kolar]

Hello all,

  my question is probably dull. So answers to better investigate manual 
are welcome. Why is this correct?

   ___         ___ _
  / _ \ /\  /\/ __(_)
 / /_\// /_/ / /  | |      GHC Interactive, version 6.4.1, for Haskell 98.
/ /_\\/ __  / /___| |      http://www.haskell.org/ghc/
\____/\/ /_/\____/|_|      Type :? for help.

Loading package base-1.0 ... linking ... done.
Prelude> putStr "Ahoj\n"
Ahoj
Prelude> putStr "Ahoj\n" `seq` 3+3
6
Prelude> :q
Leaving GHCi.

And not

Prelude> putStr "Ahoj\n"
Ahoj
Prelude> putStr "Ahoj\n" `seq` 3+3
Ahoj
6

???

Does it have something common with monads or is it a behavior of seq?

Thanks,

  Dusan