As a first step in updating NetView/390, verify that the NetView/390 subsystem address space is active, as defined in the IBM NetView/390 Installation and Administration Guide. The NetView/390 subsystem interface is necessary for cross-memory communications between NetView/390 and Ironstream. The subsystem address space is usually started when NetView/390 and the job name begins with the same four characters as the NetView/390 job name.