Johnny,

Think of ISPF as an APPLICATION that runs under TSO.  It is not a TSO
function.  It was written long ago to replace (or enhance) the programmer
environment to speed up editing and compiling functions.  Prior to ISPF
coming into being, there was the basic TSO editor.  This is a very basic
function that allows you to edit, save, and submit.  It did not have any of
the bells and whistles like ISPF.  You can still use TSO Edit functions
today.  They are the same as they were in the 1970's.

IBM then evolved the ISPF application to provide a more flexible environment
to do the same things.  And every year it just keeps getting better.

Hope that helps.

Lizette Koehler

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