My answer to "Sorting to see just unread"

This is my answer to a Question on Support site for LampCMS project

Currently unread (new) questions or questions that have new items are represented by the closed envelope icons. The logic to keep track of new items is actually implemented on client-side using html5 local storage feature.

In order to be able to have a tab where only new questions and questions with new items are shown per-user
we need to keep track on per-user 'read' activity on the server. It's a good suggestion for a new feature but it may take awhile for something like that to be added.