The easiest way to see if CA-PMO's DFDSS Interface is installed is to
BROWSE the DFDSS module ADRDSSU and do a Find on "PMODINIT".
ADRDSSU is usually in SYS1.LINKLIB.
You can also use PDSMAN's EZYEDIT to MAP the ADRDSSU module.
PMODINIT is usually the first CSECT in the module.