+<h2>
+13.7 glutGetProcAddress</h2>
+<p>
+<tt>glutGetProcAddress</tt> returns a pointer to a named GL or FreeGLUT function.
+</p>
+<p><b>Usage</b>
+<p><tt>void *glutGetProcAddress ( const char *procName ) ;</tt>
+<p><tt>procName </tt>Name of
+an OpenGL or GLUT function.
+</p>
+<p><b>Description</b>
+<p><tt>glutGetProcAddress</tt> is useful for dealing with OpenGL extensions.
+If an application calls OpenGL extension functions directly, that application
+will only link/run with an OpenGL library that supports the extension.
+By using a function pointer returned from glutGetProcAddress(), the
+application will avoid this hard dependency and be more portable and
+interoperate better with various implementations of OpenGL.
+</p>
+<p>
+Both OpenGL functions and FreeGLUT functions can be queried with this function.
+</p>
+<p>
+<b>NOTE</b>: this function is not supported in GLUT.
+</p>
+
+
+