Widespread use of Oxygen and its advanced technologies will yield a profound leap in human productivity - one even more revolutionary than the move from mainframes to desktops. By enabling people to use spoken and visual cues to automate routine tasks, access knowledge, and collaborate with others anywhere, anytime, Oxygen stands to significantly amplify human capabilities throughout the world. Oxygen enables pervasive, human-centered computing through a combination of specific user and system technologies. Oxygen?s user technologies directly address human needs. Speech and vision technologies enable us to communicate with Oxygen as if we?re interacting with another person, saving much time and effort. Automation, individualized knowledge access, and collaboration technologies help us perform a wide variety of tasks that we want to do in the ways we like to do them. Oxygen?s system technologies dramatically extend our range by delivering user technologies to us at home, at work, or on the go. Computational devices, called Enviro21s (E21s), embedded in our homes, offices, and cars sense and affect our immediate environment. Hand-held devices, called Handy21s (H21s), empower us to communicate and compute no matter where we are. Dynamic networks (N21s) help our machines locate each other as well as the people, services, and resources we want to reach.