Mobile computing: Mobile Computing is "taking a computer and all necessary files and software out into the field".[1] Mobile computing is any type of computing which use Internet or intranet and respective communications links, as WAN, LAN, WLAN etc. Mobile computers may form a wireless personal network or a piconet. There are at least three different classes of mobile computing items: • portable computers, compacted lightweight units including a full character set keyboard and primarily intended as hosts for software that may be parametrized, as laptops, notebooks, notepads, etc. • mobile phones including a restricted key set primarily intended but not restricted to for vocal communications, as cell phones, smart phones, phonepads, etc. • wearable computers, mostly limited to functional keys and primarily intended as incorporation of software agents, as watches, wristbands, necklaces, keyless implants, etc. The existence of these classes is expected to be long lasting, and complementary in personal usage, none replacing one the other in all features of convenience. .