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Refactored htmlnotebook session and kernel manager....
Refactored htmlnotebook session and kernel manager. * The KernelManager now manages multiple kernels with a uniform API. * The SessionManager now manages the full set of channels+streams and the IPython.zmq.session.Session object for a single kernel.

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logtopics.rst
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Log Topic Specification

we use pyzmq to broadcast log events over a PUB socket. Engines, Controllers, etc. can all broadcast. SUB sockets can be used to view the logs, and ZMQ topics are used to help select out what to follow.

the PUBHandler object that emits the logs can ascribe topics to log messages. The order is:

<root_topic>.<loglevel>.<subtopic>[.<etc>]

root_topic is specified as an attribute