3.1.1.6.2 Bidirectional Notification Channel Opened
A notification source that initiates the exchange of a sequence of one or more notifications and responses with a print client MUST open a Bidirectional Notification Channel (section 3.1.1.1) to do so. When opening a Bidirectional Notification Channel, the notification source MUST provide the following:
A PrintAsyncNotificationType value (section 2.2.1).
A PrintAsyncNotifyUserFilter value (section 2.2.2).