How can I get 'df - Pk' in a DIY$ view

Hello group,  

Recently somebody submitted a link to a very interesting article http://www.oracle.com/oramag/webcolumns/2001/index.html?diy_dynamic.html on how to create Do-it-yourself dynamic views... in that article the author mentions he can get the results of 'df - Pk' in a view using an external procedure. Does anybody know how to do that? I could really use it in a tool I got.  

Thanks in advance.  

Abraham Guerra
Database Administrator
American Family Insurance  

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