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Twisted Matrix

See Twisted Matrix Laboratories

At <http://python.fyxm.net/pycon/papers/deferex/#auto4>:

> E, Smalltalk, and Scheme proved particularly influential. In E's, there is a
> sharp distinction between objects which are synchronously accessible and those
> which are asynchronously accessible. The original use for Deferreds was to
> represent results from Perspective Broker method calls. E was interesting in
> that the entire execution environment had assumptions about networking built
> in. E's "eventually" operator [stiegler] is what originally inspired the
> distinction between "a method which returns X" and "a method which returns a
> Deferred that fires X".

According to <http://www.zoteca.com/information/wp/twistedusenix.pdf>
the Twisted Perspective Broker...

> uses the simple, flexible and robust capability security model, inspired by
> the E language