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+.. SPDX-License-Identifier: CC-BY-SA-4.0
+
+.. Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
+
+Introduction
+============
+
+In multiprocessor real-time systems, new requirements, such as sharing data and
+global resources between processors, are introduced.  This requires an
+efficient and reliable communications vehicle which allows all processors to
+communicate with each other as necessary.  In addition, the ramifications of
+multiple processors affect each and every characteristic of a real-time system,
+almost always making them more complicated.
+
+RTEMS addresses these issues by providing simple and flexible real-time
+multiprocessing capabilities.  The executive easily lends itself to both
+tightly-coupled and loosely-coupled configurations of the target system
+hardware.  In addition, RTEMS supports systems composed of both homogeneous and
+heterogeneous mixtures of processors and target boards.
+
+A major design goal of the RTEMS executive was to transcend the physical
+boundaries of the target hardware configuration.  This goal is achieved by
+presenting the application software with a logical view of the target system
+where the boundaries between processor nodes are transparent.  As a result, the
+application developer may designate objects such as tasks, queues, events,
+signals, semaphores, and memory blocks as global objects.  These global objects
+may then be accessed by any task regardless of the physical location of the
+object and the accessing task.  RTEMS automatically determines that the object
+being accessed resides on another processor and performs the actions required
+to access the desired object.  Simply stated, RTEMS allows the entire system,
+both hardware and software, to be viewed logically as a single system.
+
+The directives provided by the  Manager are:
+
+- :ref:`rtems_multiprocessing_announce`