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Points to Consider When Adding Drivers

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Keep the following points in mind when designing a kernel-mode driver:

  • The system-supplied SCSI and video port drivers cannot be replaced.

  • A replacement lowest-level driver must implement the same functionality as the driver it replaces. For example, a replacement keyboard or mouse port driver must use the system-defined interface between itself and a system-supplied class driver that it reuses, and vice versa.

  • A new intermediate driver, inserted between any pair of system-supplied drivers, must interoperate with those drivers so that the functionality of the upper and lower drivers is not reduced.