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Oxygen enables pervasive, human-centered computing through a combination of specific user and system technologies.  Computational devices, called Enviro21s (E21s), can sense the user's presence in an environment.  Handheld devices, called Handy21s (H21s), helps to communicate and compute while the dynamic self-configuring networks (N21s) help the devices to locate each other as well as the people, services, and resources they want to reach.  The software which runs on these devices is programmed to adapt either to the changes in the environment or with respect to the user requirements (O2S).

To summarize, Oxygen has a network based on decentralized proxies where each proxy maintains their local devices and makes sure that the communication is secure.  This decentralization aids in privacy, i.e. users can locate what they need without having to reveal their own location.  The communications have a security model based on SPKI/SDSI depending on the processing power/ memory of the devices.  Having two different protocols allows it to run a computationally inexpensive protocol on impoverished devices and a sophisticated protocol for resource authentication and communication on more powerful devices.  The advantage of this model is the decentralization it provides; but it fails to give a total-human-centered approach as it uses trusted proxies.