## Virtual Device Driver Reference for OS/2

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### VDHLockMem Parameter - PagelistArrayPtr

PagelistArrayPtr (ULONG) Pointer to array of VDHPageList_s structures.

VDHLockMem fills this array. Each VDHPageList_s structure describes a single physically contiguous sub-area of the physical memory that was locked. If PagelistArrayPtr is set to VDHLM_NO_ADDR, no array is returned. The area that PagelistArrayPtr points to must contain enough VDHPageList_s structures to handle a worst case of one structure per page plus one more structure, that is, the region does not begin on a page boundary.