The PFNMAP privilege lets a user's process
create and map page frame number (PFN) global sections to specific
pages of physical memory or I/O device registers, no matter who is
using the pages or registers. Such a privileged process can also delete
PFN-based global sections with the system service $DGBLSC.
Exercise caution when granting this privilege.
If unqualified user processes have unrestricted access to physical
memory, the operating system and service to other processes can be
easily disrupted. Such disruptions can include failure of the system,
destruction of all system and user data, and exposure of confidential