5 apple tv's one to all ply same footage?

we are a training organisation and have 5 different apple tv units, 1 in each room.

can i play a film so it appears on all units at the same time?

we are having an open day and want to play a slide show so all rooms show the same footage, id like to do i from the one computer so i dont have to run from one room to the next all night!