What means MutVar# ?

[Hans Nikolaus Beck]

Hi,

by trying to understand how "writeIORef" works, I looked at

data STRef s a = STRef (MutVar# s a)

  what is MutVar# ? (especially zhe "#" ) ? I've readed tha writeIORef 
(and readIoRef etc) is used to write directly to memory places fo 
implementing variables, as in example in HOpenGL used.  Is this also 
Haskell standard ?

Thanks for help


Hans
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