Mobile digital electronic device for use as wearable computer, camera, imaging system comprised of computer hardware and a video camera, personal broadcasting station, audio/video acquisition system comprised of a microphone and a video camera, scanner, visual activity tracker, personal digital assistant, auto audio/video documentation tool, and personal telepresence system comprised of a microphone and a video camera; hardware for wearable computers, for digital imaging systems comprised of computer hardware and a video camera, providing access to broadcast data networks, remotely accessing and transmitting data, communicating with a mobile phone, communicating with a portable user interface, and displaying data and video; computer peripheral; wearable computer peripheral; wearable peripheral for mobile digital electronic device; portable user interface for mobile digital electronic device; computer programs for wearable computers for operating system programs, setting up, configuring, and controlling wearable computer hardware, digital imaging systems comprised of computer hardware and a video camera, providing access to broadcast data networks, remotely accessing and transmitting data, communicating between a mobile phone and a wearable computer, and communicating with a portable user interface; firmware for wearable computers, namely, digital imaging systems comprised of computer hardware and a video camera, for providing access to broadcast data networks, for communicating with a mobile phone, and for communicating with a portable user interface; computer application software for mobile devices, namely, for setting up, configuring, and controlling wearable computer hardware and software, communicating with a wearable computer, viewing data acquired by wearable computers, and exchanging data between and with other wearable computers