In our previous example of a robot picking up a block, the robot and the block must be returned to their starting position. Similarly, a remote electron microscope will need its slides changing for different samples. The World-Wide Web is the most appropriate interface to most remote equipment. The design of the interface within the web browser depends upon the application. Real-time applications are a little more complex.
Network delays introduce a slight lag between action and response.
This length of delay can be avoided on a MAN, but is fairly common on Internet communications to other UK HEIs. Costs Cost of the hardware to be manipulated. This cost can be eliminated by using existing hardware. Connecting devices that are complex to interface would involve a new research project. The major cost is developing a user interface that provides quality intrinsic feedback on actions.