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use pyzmq tools where appropriate...
use pyzmq tools where appropriate ZMQStream is the right object to use for event-driven handling of messages, but instead we chose to rewrite half of it in KernelManager. This removes most of the duplicate code, in favor of using ZMQStream. also use the pyzmq install() function for using pyzmq with tornado, instead of manually pasting its contents in notebook app.
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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