You invoke ISMF by logging on to TSO. If ISMF is installed as an option on the ISPF Master Application Menu or as an option on the ISPF/PDF Primary Option Menu, specify the selection option that corresponds to ISMF. You can use ISMF to perform DFSMSdss functions against one or more data sets or volumes on a list you create. Extensive help screens are available for all the DFSMSdss functions supported by ISMF.

Related reading: For more information, see z/OS DFSMS Using the Interactive Storage Management Facility.