The sign-in lives with Pickcel, not with the screen. You give a dashboard app the account details once, and Pickcel signs in again before the session expires, on an interval you set. Nobody logs back in on the TV.
Dashboards run inside Pickcel's digital signage software, so the same console schedules them, assigns or revokes each screen's access, and records uptime and playback history for every screen. When an auditor asks whether a safety board was on display last Tuesday, the log answers.
There are two ways to render. Live mode shows the real page as it changes and accepts touch. Snapshot mode captures the page at your refresh interval and runs on every Pickcel player, which matters when one building mixes Android, LG, Samsung and BrightSign screens.