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+PR_GetIdentitiesLayer
+=====================
+
+Finds the layer with the specified identity in the specified stack of
+layers.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   PRFileDesc* PR_GetIdentitiesLayer(
+     PRFileDesc* stack,
+     PRDescIdentity id);
+
+
+Parameters
+~~~~~~~~~~
+
+The function has the following parameters:
+
+``stack``
+   A pointer to a :ref:`PRFileDesc` object that is a layer in a stack of
+   layers.
+``id``
+   The identity of the specified layer.
+
+
+Returns
+~~~~~~~
+
+The function returns one of the following values:
+
+-  If successful, a pointer to a file descriptor of the layer with the
+   specified identity in the given stack of layers.
+-  If not successful, ``NULL``.
+
+
+Description
+-----------
+
+The stack of layers to be searched is specified by the fd parameter,
+which is a layer in the stack. Both the layers underneath fd and the
+layers above fd are searched to find the layer with the specified
+identity.