thanks for the replies. i ll search the web according to this info.
Now want i really wanna know is that i have a computer to which arduino is connected through Serial port and i know how to read and send data to and from Arduino. My computer will always be ON and so i can access Arduino through computer anytime, but the thing is how to access the Arduino through Computer using Web? Sould is use VNC kinda software? Or should i build a Website (ASP.net) ?? Or should i make server using Apache? What should be the most efficient, secure and reliable way to achieve this?