Names the default target for output. The default file type is
    LIS.

    If you specify SET OUTPUT with a file name, RDO writes its output
    to a log file that you specify. The output is also written to
    SYS$OUTPUT, which is usually the terminal. If you do not specify
    a file name, RDO writes the output only to SYS$OUTPUT. The log
    file contains both statements and results. SET OUTPUT lets you
    check the results of command procedures run in batch mode.

    Example:

    RDO> SET OUTPUT DISK2:[DEPT3]PERSONNEL.LOG