The PFNMAP privilege lets a user's process create and mappage frame number (PFN) global sections to specific pages of physicalmemory or I/O device registers, no matter who is using the pagesor registers. Such a privileged process can also delete PFN-basedglobal sections with the system service $DGBLSC.
Exercise caution when granting this privilege. If unqualifieduser processes have unrestricted access to physical memory, theoperating system and service to other processes can be easily disrupted.Such disruptions can include failure of the system, destructionof all system and user data, and exposure of confidential information.
HP OpenVMS Guide to System Security
Security for the System Administrator
