In the GENPARAMS phase, AUTOGEN calculates the parameter values
    based on data stored in PARAMS.DAT and produces SETPARAMS.DAT as
    output. AUTOGEN checks to see if feedback is included, and if so,
    uses it in the calculations unless the NOFEEDBACK execution mode
    was specified when AUTOGEN was invoked. Also during this phase,
    AUTOGEN generates the known image file list (VMSIMAGES.DAT).

    The GENPARAMS phase is valid as a start phase and an end phase.
    GENPARAMS requires the SYSPRV and OPER privileges.