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Add Application.RingBell
This rings the terminal bell on Unix and Windows (tested version: 10.0.18362.535).
Does this really need a lock? We're not accessing any local variables.
If this can conflict with any other output to the terminal, it should rather be queued with QueueUpdate(). I'm not familiar enough with the bell character. Can it interrupt any other character sequences if output at the wrong time?
Thanks. I also don't know the possible extent of corruption. I've updated this to use QueueUpdate instead.