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The "Server Functions" Lesson is part of the full, Meteor course featured in this preview video. Here's what you'd learn in this lesson:
Chris explains the two publishing functions on the server that provide a list of comments and a list of users. He also spends a few minutes describing the code behind the “invite a friend” feature which sends an email to a friend from the current user. Chris ends with a walk through the way the application manages auth-tokens when users are created.