A cap nitride stack which prevents etch penetration to the HDP nitride while maintaining the electromigration benefits of HDP nitride atop Cu. The printed circuit board includes board level guides with slots for receiving correspondingly shaped ridges disposed on outer, lower portions of printed circuit card-bearing cartridges. At least two and typically three straps are also provided connectable at first and second end regions to a surface of the torso belt. Ownership of the ticket is transferred from the first user to a second user, such that, subsequent to the transfer, the second user has the right to redeem the ticket but the first user does not. An encryption key block containing first and second key portions, is then generated.