Shared memory between driver and user

Hi,



I been read the 'Sharing Memory Between Drivers and Applications' from the
NT insider, and I have a serious doubt about how to call a driver function
within the contest of the user application.



The problem is that for calling MmMapLockedPagesSpecifyCache() function I
need to be in the user space, but I think that I must do this call from the
driver.



Textually, the article says:



'.you must call the function from within the context of the process into
which you want to map the buffer.'



How can I do this?



Thanks in advance.