Frequently, the graphics card in one of your source devices can't read the top resolution supported by an attached display. For example, there may be a KVM switch in between the source and the display.In that case, it will output video at a default or native resolution that could be lower than what the display is capable of.In a PC, you could go into the video settings table and change the video output to match the display, if you even know this information. But that's not exactly a plug-and-play solution.This is where the value of a device that supports EDID comes in. EDID provides for optimal source-to-screen performance.EDID will optimize the video card output for the capabilities of the end display. The EDID ghost unit enables the copying, emulating, cloning, and "learning" of EDID data from a display.