The question is for real GURU. 1) Is the buffer, allocated by VirtualAlloc and par. PAGE_NOCACHE will be unmovable, uncachable and unswappable? AND 2) HOW to get physical address of buffer begin (address, that appears on PCI to access the physical RAM) without DDK. I need to allocate and access buffer after system initialization - in application, not in .sys driver. Thanks. If you mail me a pice of code it will be wonderfull. Mail: alpu@newmail.ru