to do this is to use a projector connected to a laptop that has VGA or HDMI out to connect to the projector, and have the audience look at the projected image. If your unnamed tablet has VGA or HDMI out, that should work also.
I would like to have a tablet that controls what is being viewed by 2+ other tablets. Instead of printing presentations to couples or board members, I would like to hand them a tablet and what I have on my tablet is what they see on the tablets I hand out. Can this be done for word, PDF, power point, internet, etc.?