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Which variants of WebSockets does it support? Both (there's really only two real-world implementations) by way of the Tornado framework. In earlier builds of Gate One it only worked with the old implementation of WebSockets but once the Tornado guys started supporting the final draft of the protocol Gate One instantly supported it as well.

For reference, I am not aware of a single other web-based terminal emulator that can resume sessions after closing your browser. Even the commercial SaaS vendors don't support this because they're all based on the same code base (Ajaxterm or Shellinabox from what I've seen).

It looks to be written using Tornado, which means that the WebSocket app is served up by the Python backend. In other words, this isn't a stand alone HTML-only implementation, which would be impossible since that's not what WebSockets do.

http://www.tornadoweb.org/ -- This one looks interesting to me. I would like to try this one. Anyone used it?

Here let me save you guys an assload of time: http://www.tornadoweb.org/ It's the framework for friend feed that facebook open sourced after they bought them out. Just because you build it doesn't mean they will come.

But the parallel processes in web servers typically don't share much data, so there's little advantage to using threads over processes, and python handles multiple processes just fine. That seems to be how they're using this framework:

We run multiple instances of the Tornado web server on multiple frontend machines. We typically run one Tornado frontend per core on the machine (sometimes more depending on utilization).