; LiveNotification : A live notification is an alert requiring a response within a set period of time (5 seconds up to several minutes) before its considered 'missed' and stored on the device separately to indicate it can no longer be acknowledged. A response is considered acknowledgement and switches the user to the appropriate application to act on the LiveNotification.
; Presence : Whether a user is at their device, an indicator of idleness in the last usage of the device. A user can choose how idle they are before appearing as 'away' or 'offline'.
;PUID : A Presence Unique Identifier. Every AppService authorized by a user to see presence updates will be assigned a PUID that it should store and associate with the user (who may or may not be logged into the application).