Question: I am running ipython notebook on my OSX machine and/or my ubuntu 14.04 machine. I am using ipython 3.0.0, and ipython (jupyter) notebooks.

When I start an ipython notebook, under New there is a terminal option, but it's unavailable for me.
I haven't been able to find any documentation on this feature, how to activate it or what it does.
The `ipython notebook --help` command doesn't mention it and I haven't found anything in the [documentation](http://ipython.org/ipython-doc/dev/index.html) either.
I haven't discovered the special keywords to search google for to get any information either.

What does this feature do? How do I activate it? Is there any documentation on this available?

![enter image description here](https://i.stack.imgur.com/crK8E.png)

Answer: 
IPython/Jupyter appears to support browser-based interactive terminal sessions. This is enabled on my machine by installing the `terminado` package with `pip` or `conda`. This fixes the "Terminals Unavailable" message on the drop-down, and lets me start up a (bash) terminal session in a new tab.

See this commit:
[IPython on GitHub](https://github.com/ipython/ipython/commit/515b791b6b3e0def1a74b816316356669f52c7f6)
Support for Windows terminals with terminado dependency was added in Jupyter 5.3.0:

<https://github.com/jupyter/notebook/pull/3087>