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+This chapter describes the NSPR API for using interprocess communication
+semaphores.
+
+NSPR provides an interprocess communication mechanism using a counting
+semaphore model similar to that which is provided in Unix and Windows
+platforms.
+
+.. note::
+
+ **Note:** See also `Named Shared Memory <Named_Shared_Memory>`__
+
+- `IPC Semaphore Functions <#IPC_Semaphore_Functions>`__
+
+.. _IPC_Semaphore_Functions:
+
+IPC Semaphore Functions
+-----------------------
+
+ - :ref:`PR_OpenSemaphore`
+ - :ref:`PR_WaitSemaphore`
+ - :ref:`PR_PostSemaphore`
+ - :ref:`PR_CloseSemaphore`
+ - :ref:`PR_DeleteSemaphore`