banner.exe is an instance controlled by client.exe on each operating system. The banner.exe can be run on a single operating system with one banner for each screen and can add up to twelve monitors or screens. The banner also supports 100% ~ 500% display scaling settings as well. (Notice: the mix screen scale setting is currently not supported yet)
(Notice: currently, a single video card can max support six monitors or screens, the actual limitation could be lifted upon request for a special use case, such as an air traffic control tower)