Library /sys$common/syshlp/sysmanhelp.hlb PARAMETERS, WRITE, Parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 destination

    The destination of a new parameter file can be any of the
    following ones:

    ACTIVE   Write parameters to memory. Using the ACTIVE parameter
             requires CMKRNL privilege.
    CURRENT  Write parameters to the system parameters file, which
             contains the current parameters on disk. Using the
             current parameter requires write (W)  access to the
             system parameters file.

             o  On Alpha systems, the file that contains current
                parameters is SYS$SYSTEM:ALPHAVMSSYS.PAR.

             o  On VAX systems, the file that contains current
                parameters is SYS$SYSTEM:VAXVMSSYS.PAR.

    filespec Write parameters to a file. The default file type is
             .PAR and you need write access to the file.