Add a message (of a predefined object type) onto a queue or dequeue
a message.
Oracle's Advanced Queuing.
See:
Oracle9i Application Developer's Guide - Advanced Queuing
Related Views:
DBA_QUEUES ALL_QUEUES USER_QUEUES
QUEUE_PRIVILEGES
DBA_QUEUE_SCHEDULES USER_QUEUE_SCHEDULES
DBA_QUEUE_TABLES ALL_QUEUE_TABLES USER_QUEUE_TABLES