Anybody able to advise please
Situation is that I have 2 shows to run main show will be through to 2
projectors and shown on two outside screens, 2 nd show will be on middle
screen with fewer slide changes but needs to change at a crucial time in the
main show.

Is there a way of performing an external trigger from show one into show 2
and what is involved hardware etc wise to do this please

Rob M