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Q. Describe the three main architectural layers of Windows XP?
Answer: (1) The HAL (Hardware Abstraction Layer) creates operating system portability by hiding hardware differences from the upper layers of the operating system. Administrative details of low-level facilities are provided by HAL interfaces. HAL presents a virtual-machine interface that is used by the kernel dispatcher, the executive and device drivers.
(2) The kernel layer provides a foundation for the executive functions and user-mode subsystems. The kernel remains in memory and is never pre-empted. Its responsibilities are thread scheduling and interrupt and exception handling low-level processor synchronization and power failure recovery.
(3) The executive layer provide a set of services used by all subsystems object manager virtual memory manager or process manager and local procedure call facility as well as I/O manager, security monitor and plug-and-play manager or registry and booting.
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1. The City of Boston needs to be about 2 acres of green space per 1,000 persons. You have been hired as the GIS expert by an independent consulting company to determine where the
Logical File System Responsible for providing the before discussed interface to the user including: File access. Directory operations. Security and protection.
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