Virtual network computing, or VNC, software lets you access a computer remotely over a network or the Internet. Most VNC programs use a VNC mirror driver to display the remote desktop on the client computer.
A VNC mirror driver gives the client computer direct access to the remote computer's video card frame buffer. It accesses the video card's frame buffer memory and uses it to update the remote desktop displayed on the client computer. The mirror driver ensures that the remote and client computers always display the same desktop.
VNC software equipped with a mirror driver performs better when compared with VNC programs that use other methods for displaying the remote desktop. Other programs take continuous screen captures of the remote computer's desktop and send them to the client. This method results in high CPU usage on the remote computer and lag on the client computer.
Using VNC software without a mirror driver produces significant lag between the two computers. It may take several seconds for the remote desktop to display user input, including movement of the mouse cursor or typed text. VNC programs such as UltraVNC, RealVNC and TightVNC include a mirror driver.
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