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+.. SPDX-License-Identifier: CC-BY-SA-4.0
+
+.. Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
+
+Introduction
+============
+
+The signal manager provides the capabilities required for asynchronous
+communication. The directives provided by the signal manager are:
+
+- :ref:`rtems_signal_catch`
+
+- :ref:`rtems_signal_send`