To amplify this, a significant use case could be: Associates (e.g. family members) hanging out in the same room. You certainly don't want to share all of your

To amplify this, a significant use case could be: Associates (e.g. family members) hanging out in the same room. You certainly don't want to share all of your windows, but you [both/all] want to act immediately on "Look what I found." Also: Helping with homework.