An improved process for the production of olefins, and in particular for separation of olefins produced by a dehydrogenation process from paraffin feed stocks, is provided. The method is based on assignment of a case in the callback function for each phase or state of the service and a stack of state descriptors. Further, the buffer chip package may have a plurality of external connection terminals. When a boundary of a document image is reached during a rapid pan or scroll, a bouncing image distortion may be applied to the document image to inform the user that the document reached a boundary during the movement. A window handle is associated with the determined virtual window name.