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 TESTGDG is an edit macro which you can invoke while in JCL.  It will scan your
 JCL and look for datasets which are GDG datasets and will construct a temporary
 CLIST which will, in turn, interactively create GDG indexes for these datasets.
 This can be helpful if you have just created some test JCL from some production
 JCL and wish to use GDGs like production does, but with test name.  This allows
 you to quickly create the GDG indexes necessary to run your job.