indicates which of the connections has fired; this connection can then
be interrogated with the C<last_event()> method to discover what event
has occurred, and the return value - an element of the C<ZOOM::Event>
indicates which of the connections has fired; this connection can then
be interrogated with the C<last_event()> method to discover what event
has occurred, and the return value - an element of the C<ZOOM::Event>