Deliverables

* A user-facing frontend that provides an environment like today's command-line IPython but running over two processes, with the code execution kernel living in a separate process and communicating with the frontend by using the ZeroMQ library.

* A kernel that supports IPython's features (tab-completion, code introspection, exception reporting with different levels of detail, etc), but listening to requests over a network port, and returning results as JSON-formatted messages over the network.