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The "Stopping Subscriptions" Lesson is part of the full, Meteor course featured in this preview video. Here's what you'd learn in this lesson:
Next, Chris takes an in-depth look at the DDP messages sent when a subscription is stopped. After that, Chris inserts a record into the Mongo database to demonstrate how the application responds to changes in the collection. When the database is changed, a new DDP message is sent to all connected clients and the user interface is updated.