One advantage of listening mode is that the server site does not have to configure its firewall to allow access on port 5900 (or 5800); the duty is on the viewer, which is useful if the server site has no computer expertise and the viewer user is more knowledgeable.The server sends small rectangles of the framebuffer to the client.A HTML5 VNC client implementation for modern browsers (no plugins required) exists too.

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Many are compatible (without their added features) with VNC proper in the sense that a viewer of one flavour can connect with a server of another; others are based on VNC code but not compatible with standard VNC.

VNC and RFB are registered trademarks of Real VNC Ltd. at Cambridge in the UK developed VNC at a time when Olivetti and Oracle Corporation owned the lab.

Popular uses for this technology include remote technical support and accessing files on one's work computer from one's home computer, or vice versa.

VNC was originally developed at the Olivetti & Oracle Research Lab in Cambridge, United Kingdom.

VNC is platform-independent – there are clients and servers for many GUI-based operating systems and for Java.

Multiple clients may connect to a VNC server at the same time.Alternatively (depending on the implementation) a browser can connect to the server (default port: 5800).And a server can connect to a viewer in "listening mode" on port 5500.VNC clients and servers negotiate their capabilities with handshaking in order to use the most appropriate options supported at both ends.As of 2013 The name Virtual Network Computer/Computing (VNC) originated with ORL's work on a thin client called the Videotile, which also used the RFB protocol.In 1999, AT&T acquired the lab, and in 2002 closed down the lab's research efforts.