Methods and instrumentalities are disclosed that enable one or more domains on one or more devices to be owned or controlled by one or more different local or remote owners, while providing a level of system-wide management of those domains. Each domain may have a different owner, and each owner may specify policies for operation of its domain and for operation of its domain in relation to the platform on which the domain resides, and other domains. A system-wide domain manager may be resident on one of the domains. The system-wide domain manager may enforce the policies of the domain on which it is resident, and it may coordinate the enforcement of the other domains by their respective policies in relation to the domain in which the system-wide domain manager resides. Additionally, the system-wide domain manager may coordinate interaction among the other domains in accordance with their respective policies.