The SHMEM privilege lets the user's process create globalsections and mailboxes (permanent and temporary) in memory sharedby multiple processors if the process also has appropriate PRMGBL, PRMMBX,SYSGBL, and TMPMBX privileges. Just as in local memory, the spacerequired for a temporary mailbox in multiport memory counts againstthe buffered I/O byte count limit (BYTLM) of the process.
The privilege also lets a user's process create or deletean event flag cluster in shared memory using the Associate CommonEvent Flag Cluster ($ASCEFC) or the Disassociate Common Event FlagCluster ($DACEFC) system service.
HP OpenVMS Guide to System Security
Security for the System Administrator
