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OSC 777 seems like a urxvt specific "random command to terminal emulator for extension plugins" thing. So I am not going to implement that.
OSC 9 seems more sensible. How is the notification supposed to be encoded? as UTF-8 text? @gnachman since this scheme comes from iTerm2 could you comment? Are there any facilites for setting subtitles? Icons? Is it allowed for users to turn this off at a terminal level? Is there any detection mechanism? Is the protocol extensible in some way?
It's in the session's encoding, which is UTF-8 for most people. No subtitles or icons. There is a per-profile preference to disable it. This is a really old control sequence dating to before my stewardship of iTerm; if you're going to build something new, it should be more powerful or at least have room for extension in the future.