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Multiscreener – a Mac-based freeware
Available at https://www.zachpoff.com/site/software/software.html
The guff –
“MultiScreener is a set of freeware applications that synchronize the playback of Quicktime movies on multiple computers, using a local network to tie them all together.It is intended for multi-screen video walls, multichannel art installations, and the like…Looping is available, and all settings are automatically saved for unattended startup…”