The Chatterbox has a new feature: private chat. To send a note to somebody (it doesn't matter if they're logged on)
type /msg or /tell --space--
(user's name) ((if the user has a space in their name you must use an _underscore_)) --space
-- whatever you want to say. The message will appear in that user's chatterbox immediately and will stay until they "check" the box next to it.
| Tim Vroom | email@example.com