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+PR_CALLBACKimplementation
+=========================
+
+Used to define pointers to functions that will be implemented by the
+client but called from a (different) shared library.
+
+
+Syntax
+------
+
+.. code::
+
+ #include <prtypes.h>type PR_CALLBACKimplementation
+
+
+Description
+-----------
+
+Functions that are implemented in an application (or shared library)
+that are intended to be called from another shared library (such as
+NSPR) must be declared with the ``PR_CALLBACK`` attribute. Normally such
+functions are passed by reference (pointer to function). The
+``PR_CALLBACK`` attribute is included as part of the function's
+definition between its return value type and the function's name.