A software example
The weakref module of Python contains a proxy() method that accepts an input object and returns a smart proxy to it. Weak references are the recommended way to add a reference counting support to an object [j.mp/wrefproxy].
ZeroMQ [j.mp/zermq] is a set of FOSS projects that focus on decentralized computing. The Python implementation of ZeroMQ has a proxy module that implements a remote proxy. This module allows Tornado [j.mp/pytornado] handlers to be run in separate remote processes [j.mp/pyzmq].
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