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When logging in, a Viewer’s Dashboard will only display events they have been allowed to access. This permission is set using Custom Filters. Simply, you assign one or more of your Custom Filters to a Viewer’s user account. Then, when they log in, they can only see the events which have also been assigned that Filter.
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Now, when the Viewer logs in, their Dashboard will only display events which have been assigned these the Filters you selected.