Mirror a screen. Watch every screen.
A browser tab is the whole client. Pick a window, screen, or tab with your OS's native picker and it appears for everyone else on this network — no install, no plugin, no account. Video travels directly between browsers; this server only keeps the roster.
Share my screen
Uses the native share picker (window, screen, or tab), streams to anyone watching, and shows who is looking.
Watch everything
A wall of every live mirror. Click one to take the stage full screen; click another to jump to it.
An unattended wall
A chrome-free wall for a kiosk display: it shows every live mirror and arranges itself from the shared layout. No pointer, no keyboard, nothing to set up at the box.
Point the wall from another device
Open it on a laptop or a phone and drive the shared wall: list the live mirrors, show one on the display, back to the wall, full screen — no video, no bandwidth.
There is no authentication: anyone this server accepts a connection from can mirror and
watch, so keep it on a network you trust and restrict which addresses it answers. Screen
capture also needs a secure context — http://localhost and any
https:// origin qualify, a plain http://<lan-ip> does not
(the Share page explains the workaround).