Sounds like a homework question.    Compare and contrast....   

--
Mark Zelden - Zelden Consulting Services - z/OS, OS/390 and MVS  
ITIL v3 Foundation Certified   
mailto:[email protected]                                       
Mark's MVS Utilities: http://www.mzelden.com/mvsutil.html 
Systems Programming expert at http://search390.techtarget.com/ateExperts/


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