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OT (See: http://en.wikipedia.org/wiki/Operational_transformation) is one of the technology solutions to the problem that you've solved through a locking mechanism.

Not sure what server architecture you're using, but in Node.js there is a pretty amazing package that integrates with ACE called ShareJS (http://sharejs.org/).

Have you experimented with synchronizing cursors at all?

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Thanks! I'll have to read up on OT. Our backend is totally hosted by Firebase, other than a simple Sinatra app that generates the unique IDs.

When you say synchronizing cursors, do you mean having multiple cursors (google docs style) or having a single cursor be in the same position for all clients? We are doing the latter, and I wasn't aware it was possible to do the former with ace but I would love to do it if I can

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