| 摘要 |
A tablet computer comprises an operating system, including an application framework layer and an application layer, and an overlay system. The overlay system controls access to application programs and provides a first user interface and a second operating environment associated with a second user interface. Optionally, the overlay system provides a first operating environment associated with the first user interface. The overlay system includes an access control configured to permit or deny a request for access in the second operating environment to resources and/or data. Optionally, the overlay system is executed in the application framework layer of the operating system and may comprise a hypervisor providing an operating platform comprising the first user interface, the second operating environment, and an application space providing access to the application layer.
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