Computer users are increasingly multi-device equipped and no h y e r sedentary. It is desirable that the execution environment i n any of these devices be customized to the user preferences and to the device ch,u,racteristics. This paper describes a framework for ,managing execution environments in 2K, an adaptable, distributed, network-centric, user-and application-oriented operating system azmed at accommodating change. A 2K environment is a container of components, devices and configurution parameters and provides an execution context for users within the 2K distributed system. A user h,as a distributed execution enuironment th,ut consists of severul subenvironments running on diflerent platforms or temporarily suspended to be resumed later. The management of the execut,ion environments is designed t o provide a usercentric view of the system; it f a c i l i t d e s user mobility, by liberating users from the restriction of being explicitly attached to specific platforms, and by seu,mlessly recruiting resources where they are available.
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