et event's subject.  The description and 
  id members are set with informations found in the first event with the same label.
  
  BTKAPPENDEVENT(H, LABEL, TIME, CONTEXT, SUBJECT) set also the event's 
  subject.  The description and id are always automaticaly set.

  BTKAPPENDEVENT(H, LABEL, TIME, CONTEXT, SUBJECT, DESCRIPTION) set also the 
  description of the event.

  BTKAPPENDEVENT(H, LABEL, TIME, CONTEXT, SUBJECT, DESCRIPTION, ID)  modifies also
  the id of the event.  Even if there is no rule for t