A congestion control mechanism in an ATM network access device includes segmentation and reassembly logic that sends and receives Asynchronous Transfer Mode cells to and from interface logic that transfers the cells to and from a switch fabric. The beneficial additive is provided to extend the useful life of lubricating oil in an internal combustion engine. The method is based on the illumination of the sample with radiation and collection of only the portion of the radiation scattered from the coating before, during and after the testing step and relating the optical signal from the tested portion of the sample material to the untested portion of the material andor a standard. The hollow glass balls 11, 12, 13, 14 also entail a significant reduction in the weight of the entire sealing plug 1. Upon selection by a user of the respective window, entertainment system data regarding the entertainment selection corresponding to the respective window is displayed.