You need to ask for one or all of:

CONTENTS_RS_3.2         List of PDs running in AIX 3.2.5/RS6000
CONTENTS_RS_4.1         List of PDs running in AIX 4.1.5/RS6000
CONTENTS_RS_4.2         List of PDs running in AIX 4.2.0/RS6000
CONTENTS_RS_4.3         List of PDs running in AIX 4.3.2/RS6000
CONTENTS_RS_5.1         List of PDs running in AIX 5.1.0/RS6000
CONTENTS_BY_CATEGORIES  List of all PDs grouped by categories
CONTENTS_UPDATES        List of recent updates to the PDs