Use this option to have ISPF automatically add your TSO user prefix as the first qualifier of the Dsname Level. When this option is selected and you have created a TSO user prefix, that prefix is added to the beginning of the Dsname Level provided the Dsname Level is not enclosed in single quotes. If the Dsname Level is entered enclosed in quotes, ISPF will not add your TSO user prefix. When this option is not selected ISPF will not accept the Dsname Level enclosed in quotes.