arries the parameters passed to the event
    handlers.  The event types are:
   </P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><A
NAME="LIBPQ-PGEVT-REGISTER"
></A
><TT
CLASS="LITERAL"
>PGEVT_REGISTER</TT
></DT
><DD
><P
>       The register event occurs when <CODE
CLASS="FUNCTION"
>PQregisterEventProc</CODE
>
       is called.  It is the ideal time to initialize any
       <TT
CLASS="LITERAL"
>instanceData</TT
> an event procedure may need.  Only one
       register event will be fired per event handler