It would be very useful to be able to have the server trigger a script on a mainscreen (and possibly other positions, like relay) so that the remote mainscreen or position could us os.execute to say play a video fullscreen via VLC. Lua already has the os.execute() function... Thoughts.
Yes I realize it could present a remote execution vulnerability, except that it would be remote triggering of a local script on the mainscreen or position's computer, not passing a script over the network to the position leaving it wide open to abuse. I also realize the potential for a crash if the position did not have the script, but I think that is a catchable condition.