Initializes the SYSGEN work area with system parameter values
    and the name of the site-independent startup command procedure,
    overwriting existing values. The initial values of the SYSGEN
    work area when the utility is invoked are the active values.

    The parameter specifies the source for both the parameter
    values and the startup command procedure name. They can be
    retrieved from a parameter file, the current system parameter
    file on disk, the active system in memory, or the default list.

    Format

      USE  file-spec