Wearable computers are especially well suited for disabled people. Under development: a universal control interface that would allow cell phones, PDAs and wearable control systems read simple hand gestures to control a wide variety of devices; small head-mounted visual displays to provide on-the-fly captioning to manage a variety of devices with wireless connections; tele-health systems for monitoring real-time vital signs in patients; and “way-finding systems,” which use a global positioning system to help people with memory dysfunctions get where they want to go or to help others locate them if they wander off.