Continuation based I/O with referential trasparency (Hope+) ?

I haven't found anything more on this yet via Googling around; anybody know more? If it really means that all I/O is referentially transparent, it would be interesting to this newbie to see compare/contrast with e.g. Monadic approaches to I/O.

From FOLDOC

It has a continuation-based I/O system with referential transparency and is capable of handling all common I/O tasks such as terminal and file I/O, signal handling and interprocess communications.

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Purely functional IO

Read this and the latter parts of this (PS).

Continuations and IO

Perhaps this is relevant.

Thanks!

I'll re-read some, and newly-read the other, and hope it sinks in this time. :-)