This is the world's dumbest question if you're a sysprog but I'm a developer
with nearly zero sysprog experience.
Whenever in the past that I have taken a quick look at SET PROG=(xx,yy) I
assumed that PROGxx + PROGyy in the parmlib concatenation *totally replaced*
the contents of whatever PROGaa and PROGbb had been specified in IEASYSxx at
IPL.
But as I read the documentation now I get the impression instead that SET
PROG=(xx,yy) causes PROGxx and PROGyy to be processed essentially as scripts
each line of which incrementally modifies whatever is already in effect. In
other words, if I entered SET PROG=ZZ and PROGZZ was devoid of statements
other than comments then the system would be left unchanged, regardless of
what had been in PROGaa and PROGbb at IPL. If PROGZZ contained one APF ADD
statement, then that DSN would get added to the APF list, much as if I had
entered SETPROG APF,ADD,DSN=...; and every other system parameter would be
left unchanged.
Is my latter impression more correct?
(And yes, I'm contemplating playing with a sandbox system, not a production
system. I get that this is serious stuff. That's why I'm asking.)
Thanks,
Charles
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