Can I show the same Display on multiple devices?

Yes, it is possible to show the same Display on more than one screen.

Let's say that you have a meeting room or a conference room with more than two entrances, it might be handy to show what's going on in that room, at both entrances.

If you want to show the same Display on multiple devices, just use the same license key or address on the second device. 

See how to show a Display on a device here.