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Accessing 64-bit storage from a CICS TS application

You would like to share data between CICS Transaction Server (CICS TS) and another address space. The data resides in 64-bit storage allocated by the other address space. IARV64 REQUEST=SHAREMEMOBJ provides this functionality, but you do not think you can use this macro when transaction isolation (TRANISO) is on and CICS is using subspaces. You would like to know, is this possible?