Hidden fields and non display fields -- MIDRANGE-L

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Hi,

I've just recently acquainted myself with the AS/400,so this question may 
sounda bit trivial.

My Query is,

What is the difference between a hidden field and a non displayed field
(with regard to subfiles).Why is RRN declared a hidden field and
PAGSIZ as a non displayed field during page by page subfile loading?

And why is a hidden field not required in the 'load all'technique?

Thanks,

         ----Vikas
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