The ISPF Data Set List Exit gets invoked once after the Data Set List
Utility Panel is filled in and then again for each data set that is
about to be displayed in the list.
The first invocation provides an opportunity for the exit to change the
data set name and/or the volume.
The subsequent invocations allow the exit to decide if the candidate
data set should actually be displayed. The parameter list for this
invocation contains five parameters. The second and third are the data
set name and volume "as specified on the 3.4 panel."
My questions are:
The process stops scanning the input data set name for a match
at the first blank, eliminating the need to blank out the rest of the
field. When the name is passed to the exit on the first invocation, is
it the entire input field or just the part that is used to perform the
match?
On the subsequent invocations, are the second and third
parameters really as specified on the panel or do they reflect any
changes made during the first invocation?
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