A System which permit computer system to be separated from output/input devices like mouse, keyboard, display monitors, audio speakers is called a Remote Graphics Unit (RGU). Graphics sub-system of the computer is the main part being remoted. Typically there are three main causes behind using separate user interface of a computer from the actual computer are:

• Decrease noise and heat from the rooms where many computer operators are working.
• Smooth the progress of  computer maintenance by placing all computers in very close closeness to each other.
• Locking computers away from users for government or commercial security.

RGU or Remote Graphic Unit originated with researches on graphics controller on mainframe computers in the 70s era. Earlier Remote graphic units are associated with high end workstations running Unix-like operating systems and later with Windows. Normally RGUs are used for some unique applications like Computer Aided Drafting, Financial Services Commodity Trading Desks, Remote Sensing e.t.c. Dedicated X terminals are also included, depending on the choice of the user how he wants to use RGU. A Remote Graphics Unit effectively split computers PCI-Express bus or PCI and then transmit only bus command over to the user side. RGUs process of working is different from that of DVI Extension and KVM Extension. Traditional graphics unit or GPU perform processing in DVI and KVM Extensions. Bus data however is way too small then rendered graphics data, theory behind the working of RGU is like it is possible to achieve better graphics and resolutions performance if only the distance of separation is large between the computer side and user side input/output devices.

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