# Locked room screens

Source: https://visuelize.com/docs/lock
Updated: 2026-10-01

A room display locks its keyboard and mouse the moment someone clicks
      Start Display. Every key, click, right-click, scroll and touch
      gesture is swallowed, so a keyboard left on the boardroom table (or a curious
      hand on the room PC) cannot change what the room sees. The control panel and the
      presenter remote stay the only ways in.

      Presentations are the exception. While a screen is showing a deck,
      whoever is standing at that machine can walk the slides:

Keys | Does |

→ ↓ Space PageDown Enter | Next slide |

← ↑ PageUp Backspace Shift+Space | Previous slide |

Home / End | First / last slide |

      Those moves go through the server exactly like a tap on the remote, so a second
      screen on the same deck follows along and the operator's panel always shows where
      the room really is. In any other mode the keys do nothing at all.

      Deliberately not blocked. Anything held with Ctrl,
      Alt or Cmd still reaches the browser: blocking
      Ctrl+R would strand a wedged screen with no way back.
      Esc and F11 still leave full screen, because the browser
      acts on them before the page ever sees the key; the display asks for full screen
      back and files a warning in the log when it cannot.

      Driving a screen by hand. Add &unlock=1 to a
      display URL to open it with the lock off: for setup and debugging on the room
      machine. The screen logs a warning so an unlocked display is never a mystery.

      Presenting from the room machine. The presenter controls on a room
      screen (Previous, Next, pointer and pen, all slides, black screen, presenter view) appear
      only after Unlock on the screen's Presenter row in Live Control. On a
      locked screen, moving the mouse shows the pointer for a moment with a short note saying
      why there are no controls: the screen is locked, another device is presenting, or Live
      Control locked that machine.