If the image is roughly acceptable, another algorithm tests the level of detail, typically by counting the number of ridges and making sure there are alternate light and dark areas (as you'd expect to find in a
Finally, when they wanted to communicate, they'd do so by breaking up messages into small packets of data and sending them around the network by a highly efficient method known as packet switching (discussed in much more detail in our article on the Internet). What's in a frame? If one...