The PRMMBX privilege lets the user's process create or deletea permanent mailbox by executing the Create Mailbox and Assign Channel($CREMBX) system service or the Delete Mailbox ($DELMBX) systemservice. The privilege also allows the creation of temporary mailboxeswith the $CREMBX service.
Mailboxes are buffers in virtual memory that are treated asif they were record-oriented I/O devices. A mailbox is used forgeneral interprocess communication.
Do not grant PRMMBX to all users of the system. Permanentmailboxes are not automatically deleted when the creating processesare deleted and, thus, continue to use a portion of system dynamicmemory. System performance degrades as system dynamic memory becomesscarce.
HP OpenVMS Guide to System Security
Security for the System Administrator
