A traffic shaper for absorbing a cell delay variation of cell flow in each of virtual connections in an ATM network is realized. The method and system also \u201clearns\u201d new abstractions for business process models by modifying existing models. The API may be referred to as a multimedia subsystem interface. A second core portion defines a second aperture having a second aperture diameter that is larger than the first diameter. The printed products are opened, wherein the second product part is placed behind the hold-open element, which is disposed on the forward receiving clement.