Enables an application in a common context session to get names of those subjects for which it will survey and be notified whenever the item values for these subjects are set during the course of a context change transaction.
participantCoupon
The participant coupon of an application that has joined the common context.
The names of the context subjects for which the application will be surveyed and notified.
If the application has not requested that all subjects be filtered, meaning that it will not be surveyed or notified during the course of any context change transaction, then the output subjectNames is empty (i.e. zero elements).