Abstract: A method of exchanging entries on calendars being maintained by a first and a second calendar users. An event is automatically scheduled on a second calendar if a classification which is associated with the event is higher than any previous scheduled event for the same time slot. A reply is prepared and transmitted to the first calendar user which requested the scheduling of the vent regarding the status of the second user in regards to the scheduled event. Subsequently, if the status of the second user changes in regards to the event, a subsequent reply is prepared and transmitted to the first user setting forth the changed status.

Abstract: A closure for a chamber having an interior which can contain a fluid under pressure provides apparatus for latching the door of the chamber in its closed position and locking it in that position when the positive pressure within the chamber reaches a predetermined level. The closure includes a door that is moved by positive pressure within the chamber and, through appropriate mechanisms, activates locking apparatus that prevents the door from leaving its closed position as long as such pressure is present within the chamber.