The only exception is the dashboard viewing page. It sends a keep-alive request to the server every few minutes to keep the session active, specifically because we expect people to have these up on wallboards. There is also a special wallboard-optimized view, which you can get to as a quick test by changing "Dashboard.aspx" in the address bar to "ViewDashboard.aspx", keeping everything else the same. The primary use of that is for publishing dashboards by creating a public link which doesn't require a login.
For directions on how to create a public link for your dashboard, please see our article on Dashboards: Creation and Access Management of Published Links.