If the link to the event is selected by the user, then that event is made {TAIL ~ the current event} in {HEAD ~ the user interface} and the other windows are updated accordingly 
If the link to the event is selected by the user , then that event is made { TAIL ~ the current event } in { HEAD ~ the user interface } and the other windows are updated accordingly
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH