Multiple sessions (SESSIONS)

If you want more than one session started when you invoke the OMVS command, use the SESSIONS keyword. The suggested maximum number of sessions is three or four. If you try to start too many sessions (the limit depends on the size of your TSO/E address space), your TSO/E user ID runs out of storage and various unpredictable errors might occur. You might have to log off your TSO/E user ID before you can continue.