The use of touchscreens in point of sale, POS, devices can speed up the transaction process and reduce employee training time. People who are computer illiterate find touchscreens easier to use than keyboards. Touch screens are also better in locations where keyboards are inconvenient or will be damaged. We can distinguish numerous flavors because, for example, the sweet taste buds respond differently to different types of sweet molecules. Smell Smell is more complicated than taste in that we have millions of odor receptors of perhaps 10,000 different types.
Dogs have more receptors and many more types.
Smells are learned through experience. We do not know the exact chemical composition of what we are smelling but recognize the pattern from previous experience. The point is that transmission and manipulation of data, words, voice, of pictures occurs through the use of binary numbers. A general purpose communications network with multimedia computers as nodes can manipulate and communicate numbers, words, voice, and images. You don't need special purpose hardware for each phenomenon.