Hi, I am using MmMapLockedPagesSpecifyCache function to map my device memory RAM to user area. It is not a security conernt to me to do by this method. I want to support this for a 32 bit application, calls 64 bit driver(64 bit system), I am taking care of 32 bit process detection, In this case, if i uses above function, it returns a PVOID, I am not sure, will get a 32/64 bit pointer, but PVOID is 64 bit in 64 bit system? Is there any way to request only 32 bit User pointer from this API? Any coversion of mapping 64 bit userarea pointer to 32 bit different user area pointer? Any other ways to support this in 32 bit process in a 64 bit driver, for getting a 32 bit User address pointer? I have tested once, I received a 32 bit pointer, but i doubt, this will not be a case always. Thanks, kota