Public channels everybody is in, and nobody leaves
Private channels for the people you add; they are told, and can leave
Direct messages between two people, found or started from either side
#general for everybody, the first time anybody opens Chat
Unread counts per channel, and on the app's icon
A push to everybody else in the channel when somebody writes
Add it to your cloud
$ cm quill add chat
Or, as an administrator, open Administration → Quills in the app and choose Chat. Either way your cloud shows you everything below and waits for your yes.
Standard. The installer offers Chat when you set up a new cloud, so you may have it already. How installing works
What it adds to your cloud
Datamodels
The kinds of data it works with. Records belong to the people who write them, not to the quill: removing it leaves every one where it is.