A real-time activity monitor operates within or in association with a machine within a back office environment to automatically track and record desktop processing activities, application usage, as well as manual processing. Consequently, occurrence of a drawback such as unexpected missing of part of a scene that is unintended to a transmitting side is avoided. The bezel includes a locking arm and two projections. On the other hand, the difference between two top envelope signals SEtop and SFtop is calculated by a third subtracter to generate a difference signal. Changes become necessary when a network event results in a loss of resilient bandwidth that effects the traffic class under admission control.