Managing the display information using customizable EDID management by a professional GPU adds a great deal to stability and reliability of an AV system.
EDID Management is available as a feature of NVDIA's range of professional graphics cards, currently all NVIDIA Quadro and NVS cards come with this feature. We stronlgy recommend to use EDID management, explicitly when using multiple projectors.
There are some guides that show how EDID Management works:
PLEASE NOTE: EDID MANAGEMENT IS NOT AVAILABLE ON NVIDIA GEFORCE GRAPHICS CARDS!