dition to the primary control file
     <TT
CLASS="LITERAL"
><TT
CLASS="REPLACEABLE"
><I
>extension</I
></TT
>.control</TT
>,
     an extension can have secondary control files named in the style
     <TT
CLASS="LITERAL"
><TT
CLASS="REPLACEABLE"
><I
>extension</I
></TT
>--<TT
CLASS="REPLACEABLE"
><I
>version</I
></TT
>.control</TT
>.
     If supplied, these must be located in the script file directory.
     Secondary control files follow the same format as the primary control
     file.  Any parameters set 