Typical Infrastructure Configurations
Single signage screen(1 computer (with a connection to MIDAS), 1 display device)
Multiple signage screens all showing the same content(1 computer (with a connection to MIDAS), 1 VGA/DVI/HDMI splitter/distribution amplifier (or similar), multiple display devices)
Two signage screens showing different content from a single computer(1 computer (with a connection to MIDAS) with a dual-head graphics card), two display devices)
Multiple signage screens showing different content(Multiple computers (with connections to MIDAS), multiple display devices)
iPad/Tablet:Instead of the above setups where a central computer (or computers) output their display to various screens/monitors, you can instead have iPads or other tablets around your venue (outside rooms, etc) and have these as your screens, showing generated content from the Digital Signage addon.
This method has the additional benefit of not having the same cabling requirements as the PC/Desktop/Server infrastructure configuration (i.e. you don't have to cable each iPad/Tablet back to a central server)