If multiple MSO regions are active, MSO users must select the proper region. This is done differently for each access method.
VTAM users select an MSO region by specifying the proper applid in the VTAM LOGON command.
CICS users select an MSO region by executing the proper version of the MSO transaction, which has a different name for each MSO region.
TSO users select an MSO region by allocating the corresponding MSGET and MSPUT files in the CLIST that calls MSUSER.
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