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.
There is no authentication: anyone who can reach this address can mirror and watch. Keep it
on a network you trust. Screen capture also requires a secure context —
http://localhost qualifies, a plain http://<lan-ip> does not
(the Share page explains the workaround).