Multiple instances of the exec module

Hi All, I am new to FreeRadius and in fact Radius. Having spent some time playing with FreeRadius (Windows ver) I need to call an external program in the preacct, authorize & authenticate sections. While the code comment in the piece prior to the exec module states the following: # If you wish to execute an external program in more than # one section (e.g. 'authorize', 'pre_proxy', etc), then it # is probably best to define a different instance of the # 'exec' module for every section. I am lost as to where or maybe how this definition is done. If I duplicate the exec module in the actual section, RadiusD complains about 'wait' not being defined. Can anyone provide guidance? Many thanks Les Brinkworth