http://isdb4l77sjqoy2qq7ipum6x3at6hyn3jmxfx4zdhc72ufbmuq4ilwkqd.onion/docs/guide/send-messages.html
Sending "live" messages You can use "live" messages for your recipients to see the messages as you type them, without having to tap "Send" button until it's completed. It can be useful in these scenarios: Real-time conversation, like talking in person or in a discussion club. You can retract what you wrote, but your recipients would see it.