1. Virtual Network Computing

2. Introduction About VNC Why VNC ? VNC Protocol VNC Servers & Clients
Limitations of VNC
Where to get VNC ?

3. About VNC
VNC is remote control software which allows you to view and interact with one computer (the "server") using a simple program (the "viewer") on another computer anywhere on the Internet.

4. About VNC
Remote control system of other computer windowing environments.
Allows access to “desktops” of like or different operating systems.
The two computers don't even have to be the same type, so for example you can use VNC to view an office Linux machine on your Windows PC at home.
VNC is freely and publicly available and is in widespread active use by millions throughout industry, academia and privately.

5. Why VNC ? Freedom to choose your favorite computing environment
And still have access to the more powerful UNIX system
Remote access is made possible to the major platforms
You want to work at home, but you forgot that one critical file at school on the…
Reinforces the concepts of client/server software
Concept foreign to most PC/MAC users

6. VNC Protocol
RFB(remote frame buffer) is a protocol for remote access to graphical user interfaces.
The protocol simply allows a server to update the frame buffer displayed on a viewer. Because it works at the frame buffer level it is potentially applicable to all operating systems.
This includes X/Unix, Windows, and Macintosh, but might also include PDAs, and indeed any device with some form of communications link. The protocol will operate over any reliable transport such as TCP/IP.

7. VNC Protocol
The VNC protocol is a simple protocol for remote access to graphical user interfaces. It is based on the concept of a remote frame buffer or RFB.

9. VNC Clients
Writing an VNC viewer is a simple task, as it should be for any thin-client system. It requires only a reliable transport (usually TCP/IP), and a way of displaying pixels (either directly writing to the frame buffer, or going through a windowing system).
VNC clients exist for all things of Unix, Windows, Macintosh, Java and for smaller hand-held appliances.

10. VNC Server Provides the “remote” half of the “remote control” system
Communicates interactions from the remote machine to the local machine
Exports the view of the remote “desktop” screen environment to a local machine
Imports keyboard and mouse inputs from local machine to remote machine

11. VNC Viewer Provides the “local” half of the “remote control” system
Communicates interactions between local machine to the remote machine
Imports the view of the remote “deskstop” screen environment to the local machine
Exports keyboard and mouse inputs from local machine to remote machine

12. Limitations of VNC VNC is network resource intensive
High Bandwidth connection = Good situation
Low Bandwidth connection = Bad situation
File systems are still separate between different operating systems
Transferring files still requires other mechanisms (e.g. ftp)
Access to non-Unix platforms do not have good multi-user support
PC/MAC lack general concept of several user access.

13. Where to get VNC? AT&T Laboratories, Cambridge UK
Available for UNIX environment
Requires system administrator privileges
Already installed on the CIS machines
Available for Windows platform
Requires you to download and install on your machine
Available for Mac platform
Available for Java-enabled browsers

14. Security
Password
SSH Encryption
Virtual Machine
Isolation

15. Thank You