The present invention provides a widely variable and yet precisely controlled system for metering the flow of fuel to an engine component. The transparent covering is placed on top of the uppermost booklet page and extends beyond the booklet pages on two sides, whereby the covering has an adhesive layer, which is located on the underside of the portions extending beyond the booklet pages and by means of which the covering is fixed to the container wall. A display of a non-flashed frame can be frozen while a flash event would otherwise cause a flashed frame to be displayed. Additionally, if a discontinuity is provided in the non-uniform phase profile, interaction of the discontinuity with surface features of the second surface will provide enhanced resolution of the surface features. In one embodiment, the digital media resource messaging system includes services to view, manage, organize, edit, and exchange digital images and video sequences. The target value for the position of the clutch is compared with a corresponding actual value and, on the basis of the deviation between the target and actual values, a control parameter is generated for adjusting the clutch.