[roughfalls]

My concern about security is that this would be used like Slack, but for apps -- always on, sitting in the background, occasionally has my attention.

If I drag an app that has an integrated terminal (e.g., VS Code), could one of my teammates start rooting around in my filesystem?

It wouldn't be too hard to use Slack status to determine a time to do this when the other people sharing are not online/not watching.

[coscreen]

This could theoretically happen but you can also choose to stay passive/appear offline with a touch a button and if you are online/sharing you can see a faint glowing border & hint around the specific display. We've already considered to use other clues to help and will look into this, great feedback!