## Physical Device Driver Reference

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### SCREENDD_GETLINEARACCESS (0Bh) - Remarks

If an application requires access to a video aperture other than 64KB between A000 and BFFF, it may obtain a linear address by way of this IOCtl. The address is returned in the linear address field of the packet. The physical address and the aperture size are limited by the adapter's memory- mapping capabilities on a given system.