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This technote explains how you can write code that is coordinated with the login process. This is useful in a number of circumstances. For example, if you're developing a product for managed installations that resets the user's preferences to some known state, you want your code to run after the user's home directory is mounted but before any user processes have run. Historically such products might have used the login hook, but the technique described in this technote (an authorization plug-in) has a number of important advantages over the login hook.