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Stores data pertaining only to a single print job. This differs from nsIPrintSettings, which stores data which may be valid across a number of jobs.
This interface is currently empty since, at this point, only platform-specific derived interfaces offer any functionality. It is here as a placeholder for when the printing session has XP functionality.
The creation of a component which implements this interface will begin the session. Likewise, destruction of that object will end the session.