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Does it work with Slack?
Unreliably yes. Slack no longer provides a public API for streaming directly to a client. The company I am working at love to host presentations with comments floating around, I think it'd be cool to stream from Slack so I did it anyway in some rather hacky approach. So yes, it sort of works until it doesn't.
How do I stream from Slack?
In the text field where you should enter your instance's hostname, enter your Slack workspace URL, such as "abcde.slack.com". You should see a web browser popping up. After logging in, select a Channel. All the messages in that channel will be displayed on screen.
Sometimes the Slack credentials expire, and TootRain should present the web browser for you to login again.