Abstract: A calendar system enables a user to display both accepted and declined invitations to events in a same or any time slot. Declined invitations can be later recalled and have their status changed to accepted. To recall a previously declined invitation for acceptance, the declined event displayed on the calendar is opened, the status changed from declined to accepted, and the updated accepted status is sent to the sender to indicate that a previously declined event has now been accepted.

Abstract: A lighting inverter provides voltage and current to a gas discharge lamp in general and a metal halide lamp in particular with a novel power factor controller. The power factor controller. step down converter having the device stresses of a buck converter, continuous current at its input like a CUK' converter, a high power factor, low input current distortion and high efficiency. The inverter consists of two cyclically rotated CUK' switching cells connected in a half bridge configuration and operated alternately. The inverter is further optimized by using integrated magnetics and a shared energy transfer capacitor. The AC voltage output from the inverter is regulated by varying its frequency. A ballast filter is coupled to the regulated output of the inverter. The ballast filter is formed by a series circuit of a ballast capacitor and a ballast inductor. The lamp is preferably connected across the inductor to minimize the acoustic arc resonance.