NTSTATUS MmMapUserAddressesToPage( IN PVOID BaseAddress, IN SIZE_T NumberOfBytes, IN PVOID PageAddress ); Routine Description: This function maps a range of addresses in a physical memory VAD to the specified page address. This is typically used by a driver to nicely remove an application's access to things like video memory when the application is not responding to requests to relinquish it. Note the entire range must be currently mapped (ie, all the PTEs must be valid) by the caller. Arguments: BaseAddress - Supplies the base virtual address where the physical address is mapped. NumberOfBytes - Supplies the number of bytes to remap to the new address. PageAddress - Supplies the virtual address of the page this is remapped to. This must be nonpaged memory. Return Value: Various NTSTATUS codes. Environment: Kernel mode, IRQL of APC_LEVEL or below.