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How to Cancel a Subscription to an Event
When a client leaves an application by calling tpterm(3c), all of its subscriptions are canceled unless the subscription is specified as persistent. (If persistent, the subscription continues to receive postings even after a client performs a tpterm().) If the client later rejoins the application and wants to renew those subscriptions, it must subscribe again.
A well-behaved client unsubscribes before calling tpterm(). This is accomplished by issuing a tpunsubscribe(3c) call before leaving an application.
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