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It's basically a demo of their native code sandbox technology: (P)NaCL

https://developer.chrome.com/native-client

This new online notebook system is probably the successor of:

http://colaboratory.jupyter.org/welcome/

Is this really a demo of PNaCl? While I can find references to a previous project also called Colaboratory, which appears to have a Chrome app and probably indeed used NaCl/PNaCl, this actually appears to connect to a backend of some sort, as evidenced by the "Registration required" whenever you try to run any code in Google Chrome.

I was confused. This is a hosted colaboraty service.

But the new google drive / jupyter integration is called jupyter-drive:

https://github.com/jupyter/jupyter-drive

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