Library /sys$common/syshlp/helplib.hlb
SET, RMS_DEFAULT, Qualifiers, /PROLOG
 *Conan The Librarian 

       /PROLOG=n

    Specifies a default prolog level for indexed files where
    acceptable values for n are 0, 2, or 3. If 0 (default) is
    specified, RMS sets an appropriate prolog level.
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